Five Matches To Watch: Day 4
Eugenie Bouchard vs. Andrea Petkovic
After her upset of Christina McHale on Wednesday, Genie Bouchard said she was proud of how she played and how calm she remained during their tight first set. The 23-year-old former world No. 5 will need to stay cool and collected against Andrea Petkovic on Wednesday. Petkovic, 29, has never lost to her Canadian opponent on hard court.
 Kristina Mladenovic vs. Bianca Andreescu
At just 17 years old, Andreescu scored her first ever WTA win on Monday when she defeated Italy’s Camila Giorgi. With nothing to lose, it will be interesting to watch how she handles herself against the hard, flat hitting Frenchwoman. Mladenovic, currently ranked No. 13 in the world, struggled with heat issues during a lengthy first-round battle against Tatjana Maria on Wednesday. Will she be fresh for her face-off against the young Canadian?
 Jack Sock vs. Jared Donaldson
American Jared Donaldson has quietly been having the best season of his young career, reaching a high rank of No. 58 soon after making a run to his second Grand Slam third round at Wimbledon last month. The 20-year-old will get another crack at Sock this afternoon after a 6-2, 6-1 drubbing from the native Nebraskan in Miami earlier this year.
 Kei Nishikori vs.  Juan Martin del Potro
Juan Martin del Potro has had some unlucky draws since returning to the tour 18 months ago following his third wrist surgery. But, it might be Nishikori who is lamenting his tough draw on Thursday. The No. 2 seed will face del Potro tonight, not before 7:00, having won just one time in their six meetings. If del Potro is serving well, this could very well be an upset.
 Dominic Thiem vs.  Kevin Anderson
Thiem won his first-round match over Henri Laaksonen in just 63 minutes. He’ll be in for a tougher test on Thursday against former world No. 10 Anderson. The 6-foot-8 South African has struggled with injuries over the past two seasons, but he holds a 5-0 head-to-head record over the top-seeded Thiem. If healthy and serving well, Anderson could play spoiler to the Austrian’s first trip to D.C.