The Danish tennis player Caroline Wozniacki has a soft spot for the United States Open, which begins on Monday in Flushing Meadows, Queens. “The atmosphere is always spectacular,” said Ms.Wozniacki, 26, who last reached the women’s singles final in 2014 (she lost to her good friend Serena Williams). “The fact that it’s in New York makes it even more special.” Ms. Wozniacki travels frequently, but she considers herself a New Yorker. During the Open, she appreciates the nightly retreat to her apartment overlooking Union Square, which she shares with her Pomeranian, Bruno. The tournament is also nicely coordinated with another of Ms. Wozniacki’s favorite events: New York Fashion Week. Perhaps she’ll go with Ms. Williams, or someone else from her group of close-knit city friends.  CARBS, REALITY SHOWS Sundays are usually my day off. I’m able to sleep in, so I’ll probably wake up around 9:30, have some cereal, maybe a bagel, go to the couch, watch some TV. I love to watch “Property Brothers.”  IT’S CHEAT DAY I’ll probably call up one of my girlfriends. We have this coffee shop right on the corner. It’s called the Coffee Shop. We’ll go for a late brunch. They have the best pancakes. I have a “cheat day” a week. I can really indulge and treat myself.  CITYSCAPE Then we’ll probably just have a stroll around the city. I love New York. It’s my favorite city in the world. I love Union Square. You have the farmers’ market. I have a lot of friends who live in the area. It’s close to everything — to downtown, to meatpacking. It’s very young.  TAKING IN THE SCENE We go for a walk or a run down the West Side Highway, go play miniature golf and maybe a bit of basketball. I love to just people watch. I like to make up my own stories about people, where I think they come from or where they’ve met. I like to see how people interact with their dogs. Sometimes I just look at clothes. Fashion says a lot about a person.  DESIGN FOR LIVING I have a big passion for fashion and have my own tennis collection with Adidas and Stella McCartney. We’ve done my tennis dress — done that together since 2009. On Sundays, when I have time to reflect, I’ll draw something. I’ll take pictures — to have as references for when I do my dress in the future.  CHILL TIME It’s probably about 5 or 6 o’clock. We’ll go home and shower. We’ll meet up at Soho House later that night and just have a nice dinner, a chill dinner, and just relax. I have to say that I love their dessert, their chocolate chip cookies with sea salt on them. I know this is not healthy, but it’s something that I look forward to.  WIND DOWN Around 10, 10:15, we just start parting ways — walk home and call it a day. I usually go to sleep around 11 o’clock so that I’m ready for a 9 o’clock or an 8 o’clock practice the next morning. I’ll go brush my teeth and pack my bags, so I can just wake up and almost just jump out the door. I’ll get into bed and maybe read.  READ TO REFLECT I like to read. This book I just finished, it’s called “The Power of Your Subconscious Mind.” As an athlete, so much of our game is mental. It’s kind of nice to read some of these books and get to know yourself a bit better. If you’re in a stressful situation on the court, it gives you some nice helpful tips how to get past those situations.  SLOW THE SPIN I’ve always been a very positive person. I feel like sometimes we go through failures or tough times, but I always think that there’s a reason for it. Maybe it just wasn’t my time yet. During the day, my mind is constantly spinning. But I’m also very good at just turning that off. When I feel really sleepy, I’ll just go to bed.  STRETCH THE DAYS OUT I love the U.S. Open. Hopefully I’ll make it to the finals. Then I’ll stay a few days for New York Fashion Week. I like to go to a few shows. I went to Serena’s fashion show last time. I went to Prabal Gurung’s show, Michael Kors as well. Then leave on Thursday, to Asia, because we have tournaments there.  #SundayRoutine readers can follow Caroline Wozniacki on Twitter @CaroWozniacki.  A version of this article appears in print on August 28, 2016, on page MB2 of the New York edition with the headline: Tennis Star Cheats! (Pancakes. Cookies.). Order Reprints| Today's Paper|Subscribe
As the U.S. Open begins, the tennis player, who last reached the finals in 2014, tries to balance rest and fun with preparing for her next match.