2019 U.S. Open: Matches to Watch on Sunday

ASHE STADIUM, Noon

Some were worried that Federer’s first two rounds at this year’s Open might have indicated that he wasn’t quite up to speed. He took some time off after his defeat in the Wimbledon final to travel with his family, and played only one tournament in preparation for the U.S. Open, losing to Andrey Rublev in the round of 16 in Cincinnati. Those worries were alleviated when Federer blitzed Dan Evans in the third round. It took Federer just 1 hour 20 minutes, and at one point he won 21 consecutive points on his serve, an incredibly difficult feat to pull against any professional tennis player. You can imagine the kind of plaudits that would be rained down on a professional quarterback who was able to complete 21 passes in a row.

His opponent Sunday is the 15th-seeded Goffin, who reached the quarterfinals at Wimbledon and the final in Cincinnati. Goffin has been playing gritty tennis during his run to the round of 16. In his last match, against Pablo Carreño Busta, he needed three hours to dispatch of the Spaniard in three sets, winning a majority of the rallies that went five shots or longer.

AS HE STADIUM, DAY SESSION

In beating Karolina Muchova in straight sets on Friday, Williams returned 80 percent of Muchova’s serves and was able to keep a consistent level of pressure on her. Points were kept short, with an average rally lasting under three shots. In Williams’s way Sunday, in the second match on Ashe, is Martic, the 22nd seed, who has had a particularly good year at age 28. She reached her first Grand Slam quarterfinal, at the French Open, and also won her first WTA title, in Istanbul in April. Martic is a powerful server and a particularly good returner of serve.

Armstrong Stadium, Day Session

Fans at the Open haven’t seen the last of Coco Gauff. After losing to Naomi Osaka in singles on Saturday night, Gauff still has her eyes on the doubles title with Caty McNally, who lost to Serena Williams in the second round of singles. The American teenagers partnered up to win the Citi Open in Washington last month, and won the U.S. Open junior doubles title last year. Their second-round test, in the third match at Louis Armstrgon Stadium is against the ninth-seed team of Nicole Melichar and Kveta Peschke. The two won the title at the Silicon Valley Classic in early August and reached the quarterfinals at the French Open and Wimbledon this year.

ASHE STADIUM, 7 p.m.

Svitolina, the No. 5 seed, has never made it past the fourth round at the U.S. Open, but after reaching the quarterfinals at the Australian Open and the semifinals at Wimbledon this year, she may be ready for a breakthrough. But Keys was the runner-up at the U.S. Open in 2017 and reached the semifinals last year; she also won the Cincinnati tournament ahead of the Open. Most significant, perhaps, the 10th-seeded Keys is undefeated in night matches at the Open in her career. She was treated for an illness during her third-round win over Sofia Kenin, but if she is healthy, she has a good chance at the upset.