“And it got a little heated, and you saw what happened,” Manuel said.  Manuel and Beltrán watched the rest of the debacle from the clubhouse. Yet somehow, they were not joined by Pérez until the end of the fifth inning.  Pérez struggled from the start, allowing three of the first four hitters to get on base before Richie Sexson’s sacrifice fly brought in a run. Pérez allowed two more in the second, though Castillo’s slow move to his left followed by an error were partly to blame. Kenji Johjima added a two-run homer in the third to Pérez’s already unflattering line.  “He wasn’t very good tonight,” Manuel said of Pérez, who allowed six runs, seven hits and a walk in five innings. “There is some concern about his struggles right now. We’re going to have to seriously address it.”  The loss evened his record at 5-5 and lifted his earned run average to 5.29 during a season in which he has performed without the control or the poise that carried him to 15 wins and a 3.56 E.R.A. last year.  The faith that the Mets put in him when they acquired him from Pittsburgh midway through the 2006 season — his record was 2-10 at the time — may be running low. Pérez is eligible to become a free agent at the end of the year, and Manuel admitted that there would be some discussion as to his place in the rotation.  Claudio Vargas, one of the stopgap solutions in the Mets’ pitching staff, came in to pitch the sixth and proceeded to allow four more runs before leaving the field to a blend of boos and ironic cheers. That turned out to be his last contribution to the team before being designated for assignment after the game. The 27-year-old right-hander Carlos Muniz was called up to take his spot in the bullpen.  The four runs the Mariners scored off Vargas in the sixth matched the total number of runs they scored through the entirety of their first trip to New York this season, a three-game series at Yankee Stadium in May. Later in May, the Mariners were swept again in three games by the Yankees. Through six games in New York, Seattle had scored a total of 17 runs and allowed 50.  For seven innings Tuesday, the Mets were held scoreless by Dickey, who came into the game with a 5.77 E.R.A. this season and a 1-11 record in his last 12 decisions dating to May 2004.  Though Manuel has made a point of telling his hitters to be more patient and has instituted extra hitting before games, the rewards were nowhere to be seen Tuesday as they flailed haplessly at Dickey’s knuckleball.  David Wright was rested for the first time this season, but his presence in the lineup may not have softened the boos that echoed around a quickly emptying Shea Stadium.  “Right now we’re a bad offensive club,” Manuel said. “Period.”  A version of this article appears in print on , on Page D1 of the New York edition with the headline: Two Blowouts, and One Blowup | As Perez Struggles, Mets Knuckle Under To Lowly Mariners. Order Reprints| Today's Paper|Subscribe
By the time the fourth inning rolled around, and the Mets trailed by five runs against Seattle, the team with the worst record in baseball, it did not take much to set tempers ablaze.