US Open Tennis 2015 Schedule: TV, Live Stream Info for Sunday's Draw

Sunday wraps up the first full week at the 2015 U.S. Open, and it marks the beginning of the fourth round of singles play in the men's and women's draw.

Novak Djokovic and Serena Williams headline Sunday's action. Djokovic is in the prime-time evening spot at Arthur Ashe Stadium. He'll be taking on Spain's Roberto Bautista Agut. Meanwhile, after defeating Bethanie Mattek-Sands in three sets Friday, Williams will take on another American challenger in Madison Keys. 

It's yet another stacked day of action in Flushing Meadows, New York. Here's the television schedule for Sunday, followed by a preview of the day's can't-miss match. Live streams begin at 11 a.m. ET on WatchESPN.

Time (ET)	Round	TV
8 a.m. - 11 a.m	Breakfast at the US Open	Tennis Channel
11 a.m. - 7 p.m.	Round of 16	ESPN2
6 p.m. - 11 p.m.	Prime time at the US Open: Round of 16	ESPN2
11 p.m. - 8 a.m.	US Open Tonight	Tennis Channel

Match to Watch

No. 1 Serena Williams vs. No. 19 Madison Keys

Mike Stobe/Getty Images

Now that Mattek-Sands made Williams look at least somewhat vulnerable, the march to a fifth straight Grand Slam title is officially a gauntlet, not a procession leading to a coronation.

Williams dropped the first set to Mattek-Sands 3-6, but she maintained it was her opponent's stellar play and not her own failings that left her vulnerable Friday.

"I'm not trying to live on the edge," she said, according to ESPN.com's Greg Garber. "I don't think I came out too slow, I just think Bethanie played really well."

Williams took over with her powerful serve, winning 28 of 32 first-service points in the second and third sets, per USOpen.org. That devastating serve alone would run a number of top players off the court, but Keys has the power and guile to handle Williams' best.

Elsa/Getty Images

The 20-year-old defeated No. 15 Agnieszka Radwanska in straight sets Friday to book a date with Williams. She showed off her own strong serve in that match, smashing seven aces to Radwanska's goose egg in that category, per USOpen.org.

And as ESPNW.com's Melissa Isaacson notes, Keys has the strength to combat Williams if the match devolves into a display of quick points and power tennis:

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In one of the more amazing, and somewhat buried, statistics in the tournament, Keys, at 5-feet-10, is the second-hardest hitter at the US Open among men and women, with an average groundstroke speed (going into Saturday) of 74 mph. (David Goffin is first at 76 mph.)

Serena, who is an inch shorter than Keys, is hitting her groundies at 67 mph, tied for fourth among the women, behind Keys, Camila Giorgi and Venus.

"

Keys is an ascendant star in the sport, but this is Williams' tournament to lose. If Keys has any advantage, it's the element of unfamiliarity. Williams has faced her only once, beating her in straight sets in the semifinals of the 2015 Australian Open. Williams dominates the top competition, but she occasionally struggles against unfamiliar, less-heralded opponents.

This match will likely go to three sets again, but Williams won't end up in quite as much trouble as she did against Mattek-Sands. The calendar Grand Slam will survive another day.