New Haven - Top-seed Agnieszka Radwanska breezed past 19-year-old Jelena Ostapenko 7-5, 6-1 on Tuesday night in the second round of the Connecticut Open.
The fourth-ranked player in the world trailed 4-5 and faced a set point before taking control of the match.
Olympic doubles champions Ekaterina Makarova and Elena Vesnina of Russia became the first players to advance to the third round of the singles competition.
Vesnina was leading Anett Kontaveit 6-4, 1-0 when the 20-year-old Estonian withdrew with a left thigh injury.
Makarova beat qualifier Anatasija Sevastova of Latvia 6-3, 6-2.
Belgian Kirsten Flipkens added to an already memorable summer by beating Belinda Bencic of Switzerland 6-1, 4-6, 7-5.
Flipkens, who upset Venus Williams at the Olympics, had lost in the second round of qualifying in New Haven. But she was moved into the main draw after Ukrainian Lesia Tsurenko withdrew earlier in the day with a right knee injury.
Results from the WTA Connecticut Open on Tuesday (x denotes seeded player):
Ekaterina Makarova (RUS) bt Anastasija Sevastova (LAT) 6-3, 6-2
Elena Vesnina (RUS) bt Anett Kontaveit (EST) 6-4, 1-0 abandon
Agnieszka Radwanska (POL x1) bt Jelena Ostapenko (LAT) 7-5, 6-1
Elina Svitolina (UKR x10) bt Evgeniya Rodina (RUS) 6-3, 6-1
Kirsten Flipkens (BEL) bt Belinda Bencic (SUI) 6-1, 4-6, 7-5
Johanna Larsson (SWE) bt Timea Bacsinszky (SUI x7) 7-5, 6-2