Stephen Haas/Associated Press
Day 1 Results
Karolina Pliskova def. Kimiko Date-Krumm 6-1, 6-3
Sachia Vickery def. Shuai Zhang 6-1, 6-2
Naomi Osaka def. Samantha Stosur 4-6, 7-6(7), 7-5
Varvara Lepchenko def. Caroline Garcia 6-4, 6-3
No. 8 Andrea Petkovic def. Ajla Tomljanovic 6-1, 6-4
Coco Vandeweghe def. Kristie Ahn 6-2, 7-5
Day 1 Recap
Karolina Pliskova dominated Kimiko Date-Krumm in the day's first singles match. The Czech star overpowered her foe on the serve, notching six aces and winning 62 percent of her first-service points over the course of her two-set victory. Date-Krumm was on her back foot all day, but she did hold tough at times, saving 10 of 15 break points in the match.
Sachia Vickery notched a breezy victory over Shuai Zhang. Neither player had a very powerful serve working, but Vickery's toughness saw her through to the next round. She saved all three of her break points and won 80 percent of her second-service points in the match. Zhang didn't make things easy on herself, recording four double faults during the match.
Naomi Osaka had to engineer a comeback to defeat Samantha Stosur over three sets Monday afternoon. Stosur won the first set, 6-4, but there were signs she would have trouble as she won just one of 12 first-serve return points on the day.
Sure enough, Osaka regained her composure and edged out Stosur in the second set on a tiebreaker. It then took Osaka seven games to win the third set, made possible by winning 71 percent of her first-service points in that set.
Elsewhere, Varvara Lepchenko handled Caroline Garcia in quick fasion. Lepchenko dispatched Garcia in straight sets largely because she won 73 percent of her first serves and saved 85 percent of break points. The outcome was never in doubt and Lepchenko looks primed to compete in the immediate future.
Andrea Petkovic demonstrated why she has the No. 8 seed in the tournament Monday when she quickly dispatched with Ajla Tomljanovic in straight sets. Petkovic controlled the match from the early going and never looked back. Tomljanovic certainly played better in the second set, but the writing was on the wall after a dominating first set.
It was a straight-set type of day Monday, and Coco Vandeweghe's victory over Kristie Ahn ensured that five of the six matches ended in only two sets. Vandeweghe enjoyed an 8-1 advantage in the aces department, and she won 81 percent of her first-service points. That type of dominance with the serve is hard to beat, as Ahn found out the hard way.
All stats courtesy of ProTennisLive.com unless otherwise noted.