Sloane Stephens wins late-night match easily at US Open

Stephens needed three sets and nearly three hours to win her opening match. But this one was far easier, as she hit 24 winners and only five unforced errors.

Agnieszka Radwanska, Ana Ivanovic reach Carlsbad quarter-finals

Radwanska was joined in the quarter-finals by younger sister Urszula, who stunned sixth-seeded Serbian Jelena Jankovic 6-2, 4-6, 6-3

Top seed Agnieszka Radwanska reaches Stanford semis

Radwanska, ranked fourth in the world and seeking her third title of 2013 after triumphs in Auckland and Sydney, had to battle to subdue her 40th-ranked opponent in two hours and 14 minutes.

Five-time champion Venus Williams pulls out of Wimbledon

The 33-year-old - who has won seven Grand Slam titles in all - also pulled out of the doubles there with her sister Serena because of a back problem.

Mona Barthel advances to 3rd round at Aegon Classic

In other second-round matches, fourth-seeded Tamira Paszek of Austria lost to American Alison Riske, 2-6, 6-2, 6-3, and eighth-seeded Urszula Radwanska of Poland was beaten by Croatia's Donna Vekic, 6-3, 6-2.

Venus-beater Urszula Radwanska loses out in second round at French Open

Urszula Radwanska has never made it past the second round in 13 appearances at Grand Slam tournaments.

Victoria Azarenka through, no sister act for Radwanska

Filling a mostly empty stadium court with her familiar shrieks on Wednesday, the former world No. 1 beat Elena Vesnina of Russia 6-1, 6-4.

French Open 2013: Venus Williams loses to Urszula Radwanska in 1st round

The quick exit for the 32-year-old Williams came a year after her younger sister Serena was upset in the first round at Roland Garros.

Injured Victoria Azarenka out, David Ferrer advances in Miami

Azarenka was replaced in the Miami draw by 19-year-old US lucky loser Lauren Davis, who saved three match points in the deciding tiebreaker to defeat compatriot Madison Keys 6-1, 5-7, 7-6 (9/7).

Jankovic struggles through to Carlsbad quarters

Jelena Jankovic overcame problems with her serve to claim a 2-6, 6-4, 6-4 win over Melinda Czink in the second round of the Mercury Insurance Open on Thursday.