Buster Posey (left) and Pablo Sandoval went back-to-back in the fourth during a rare display of Giant power at AT&T Park. Photo: Lea Suzuki, The Chronicle / SF  Buster Posey (left) and Pablo Sandoval went back-to-back in the...  The Giants' Barry Zito (left) confers on the pitchers mound with Dave Righetti (right) during the fourth inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Barry Zito (left) confers on the pitchers mound with...  The Rockies' Jorge De La Rosa was the starting pitcher for the Colorado Rockies. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Rockies' Jorge De La Rosa was the starting pitcher for the...  The Giants' Barry Zito was the starting pitcher for the San Francisco Giants. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Barry Zito was the starting pitcher for the San...  The Giants' Pablo Sandoval runs the bases after his homerun in the fourth inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Pablo Sandoval runs the bases after his homerun in the...  The Giants' Pablo Sandoval celebrates with teammates after hitting a homerun in the first inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Pablo Sandoval celebrates with teammates after hitting...  Pablo Sandoval homered from both sides of the plate for the first time. Photo: Lea Suzuki, The Chronicle / SF  Pablo Sandoval homered from both sides of the plate for the first...  The Giants' Buster Posey celebrates his homerun in the fourth inning with teammates. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Buster Posey celebrates his homerun in the fourth...  The Giants' Barry Zito swings at a pitch in the bottom of the third inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Barry Zito swings at a pitch in the bottom of the third...  The Giants' Barry Zito was the starting pitcher for the San Francisco Giants. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Barry Zito was the starting pitcher for the San...  The Giants' Aubrey Huff reacts after swinging at a pitch in the sixth inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Aubrey Huff reacts after swinging at a pitch in the...  The Giants' Aubrey Huff rounds the bases after hitting a double in the sixth inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Aubrey Huff rounds the bases after hitting a double in...  The Giants' Aubrey Huff (right) high fives Francisco Peguero (left) who ran for him after Huff hit a double in the sixth inning. The San Francisco Giants played the Colorado Rockies at AT&T Park on Thursday, September 20, 2012 in San Francisco, Calif. Final Score: San Francisco Giants: 9 - Colorado Rockies: 2 Photo: Lea Suzuki, The Chronicle / SF  The Giants' Aubrey Huff (right) high fives Francisco Peguero (left)...  SAN FRANCISCO, CA - SEPTEMBER 20: Wilin Rosario #20 of the Colorado Rockies scores on an RBI single from Jonathan Herrera #18 (not pictured) in the second inning against the San Francisco Giants at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Wilin Rosario #20 of the Colorado...  Colorado Rockies starting pitcher Jorge De La Rosa throws to a San Francisco Giants batter during the first inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  Colorado Rockies starting pitcher Jorge De La Rosa throws to a San...  SAN FRANCISCO, CA - SEPTEMBER 20: Barry Zito #75 of the San Francisco Giants pitches against the Colorado Rockies at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Barry Zito #75 of the San...  SAN FRANCISCO, CA - SEPTEMBER 20: Wilin Rosario #20 of the Colorado Rockies steals second base beating the throw down to Joaquin Arias #13 of the San Francisco Giants in the second inning at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Wilin Rosario #20 of the Colorado...  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 of the San Francisco Giants trots around the bases after hitting a solo home run as pitcher Jorge De La Rosa #29 of the Colorado Rockies looks on in the first inning at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 of the San...  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 of the San Francisco Giants tags out Josh Rutledge #14 of the Colorado Rockies attempting to go from second to third on a ground ball to shortstop in the third inning at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 of the San...  SAN FRANCISCO, CA - SEPTEMBER 20: Jorge De La Rosa #29 of the Colorado Rockies hits an RBI single driving in Andrew Brown #12 (not pictured) in the fourth inning against the San Francisco Giants at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Jorge De La Rosa #29 of the...  SAN FRANCISCO, CA - SEPTEMBER 20: Andrew Brown #12 of the Colorado Rockies is congraturlated by teammates after Brown scored in the fourth innng against the San Francisco Giants at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Andrew Brown #12 of the Colorado...  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 and Angel Pagan #16 of the San Francisco Giants hugs each other at home plate after Sandoval hit a three-run home run in the fourth inning against the Colorado Rockies at AT&T Park on September 20, 2012 in San Francisco, California. The home run was Sandovals second of the day. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 and Angel...  Colorado Rockies' Wilin Rosario slides safely into home plate to score the Rockies first run during the second inning of a baseball game against the San Francisco Giants in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  Colorado Rockies' Wilin Rosario slides safely into home plate to...  Colorado Rockies' Jonathan Herrera follows through on an RBI single off San Francisco Giants starting pitcher Barry Zito during the second inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  Colorado Rockies' Jonathan Herrera follows through on an RBI single...  Colorado Rockies first baseman Wilin Rosario, left, misses a fly ball hit by San Francisco Giants' Pablo Sandoval as second baseman Josh Rutledge, right, watches during the third inning of their baseball game in San Francisco, Thursday, Sept. 20, 2012. Rosario was given an error and the Giants scored a run on the play. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  Colorado Rockies first baseman Wilin Rosario, left, misses a fly...  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 of the San Francisco Giants celebrates at home plate after hitting a three-run home run in the fourth inning against the Colorado Rockies at AT&T Park on September 20, 2012 in San Francisco, California. The home run was Sandovals second of the day. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Pablo Sandoval #48 of the San...  San Francisco Giants' Pablo Sandoval gestures while crossing home plate after hitting a home run off Colorado Rockies starting pitcher Jorge De La Rosa in the first inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants' Pablo Sandoval gestures while crossing home...  San Francisco Giants starting pitcher Barry Zito, right, throws against Colorado Rockies' Carlos Gonzalez, left, during the first inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants starting pitcher Barry Zito, right, throws...  SAN FRANCISCO, CA - SEPTEMBER 20: Pitcher Barry Zito #75 of the San Francisco Giants gets a tap on the rear from third baseman Pablo Sandoval #48 as he leaves the game in the six inning against the Colorado Rockies at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Pitcher Barry Zito #75 of the...  SAN FRANCISCO, CA - SEPTEMBER 20: Manager Jim Tracy #4 of the Colorado Rockies takes the ball from pitcher Jorge De La Rosa #29 taking him out of the game in the fourth inning against the San Francisco Giants at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Manager Jim Tracy #4 of the...  SAN FRANCISCO, CA - SEPTEMBER 20: Buster Posey #28 of the San Francisco Giants is congratulated by manager Bruce Bochy (R) after Posey hit a solo home run in the fourth inning against the Colorado Rockies at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images) Photo: Thearon W. Henderson, Getty Images / SF  SAN FRANCISCO, CA - SEPTEMBER 20: Buster Posey #28 of the San...  San Francisco Giants' Buster Posey hits a home run off Colorado Rockies relief pitcher Edgmer Escalona during the fourth inning of their baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants' Buster Posey hits a home run off Colorado...  San Francisco Giants' Pablo Sandoval hits a three-run homer off Colorado Rockies relief pitcher Edgmer Escalona during the fourth inning of their baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants' Pablo Sandoval hits a three-run homer off...  San Francisco Giants' Pablo Sandoval, right, is greeted by third base coach Tim Flannery, left, after hitting a three run homer in the fourth inning of a baseball game against the Colorado Rockies in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants' Pablo Sandoval, right, is greeted by third...  San Francisco Giants third baseman Pablo Sandoval dives and misses a double hit by Colorado Rockies' Josh Rutledge during the third inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants third baseman Pablo Sandoval dives and misses...  San Francisco Giants relief pitcher Brad Penny, right, is greeted by catcher Hector Sanchez, left, at the end of a baseball game against the Colorado Rockies in San Francisco, Thursday, Sept. 20, 2012. San Francisco won 9-2. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants relief pitcher Brad Penny, right, is greeted...  San Francisco Giants outfielders from left, Gregor Blanco, Angel Pagan and Hunter Pence celebrate at the end of their baseball game against the Colorado Rockies in San Francisco, Thursday, Sept. 20, 2012. San Francisco won the game 9-2. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants outfielders from left, Gregor Blanco, Angel...  San Francisco Giants' Angel Pagan after hitting a double in the third inning of a baseball game against the Colorado Rockies in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants' Angel Pagan after hitting a double in the...  San Francisco Giants second baseman Marco Scutaro during a baseball game against the Colorado Rockies in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants second baseman Marco Scutaro during a baseball...  Colorado Rockies' Jason Giambi swings and misses at a pitch thrown by San Francisco Giants reliever Guillermo Mota in the seventh inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. San Francisco won the game 9-2. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  Colorado Rockies' Jason Giambi swings and misses at a pitch thrown...  San Francisco Giants relief pitcher Guillermo Mota throws against the Colorado Rockies during a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants relief pitcher Guillermo Mota throws against...  Sailboats pass AT&T Park during a San Francisco Giants baseball game against the Colorado Rockies in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  Sailboats pass AT&T Park during a San Francisco Giants baseball...  San Francisco Giants starting pitcher Barry Zito throws against the Colorado Rockies in the first inning of a baseball game in San Francisco, Thursday, Sept. 20, 2012. (AP Photo/Eric Risberg) Photo: Eric Risberg, Associated Press / SF  San Francisco Giants starting pitcher Barry Zito throws against the...
Two weeks ago, the Dodgers arrived at AT&amp;T Park for a three-game series, trailing the Giants by 4 1/2 games.  After their 9-2 thumping of Colorado completed a four-game sweep Thursday afternoon in China Basin, the Giants' main concern was how to walk that enviable tightrope between relishing the moment and not appearing overconfident.  The lefty departed with two outs and two on in the Giants' six-run fourth inning.  Sandoval hadn't looked so great over the past two months, a stretch that included a stint on the disabled list because of a hamstring strain.  The only time this season before Thursday that the Giants hit back-to-back homers came April 11 in Denver when Nate Schierholtz and Brandon Crawford turned the trick.  The fans could celebrate a division title this weekend with the Padres in China Basin for a three-game series.