Kvitova surrendered the encounter when she sailed a backhand crosscourt wide on the final point SHENZHEN: Top-ranked Ashleigh Barty of Australia rebounded from a set down to win her debut match 5-7, 6-1, 6-2 over Belinda Bencic of Switzerland at the WTA Finals on Sunday. Barty’s victory is her 53rd of the season, second most this season after Kiki Bertens with 54. The 5-foot-5 Barty is a surprisingly potent server and ended her first career encounter against Bencic, also playing in her first year-end final, with her 10th ace of the match. Earlier, Naomi Osaka extended her winning streak to 11 matches after defeating Petra Kvitova of the Czech Republic 7-6 (1), 4-6, 6-4 in the first of three round-robin matches on the day. Osaka, the Australian Open champion, arrived in Shenzen having won the last two tournaments she played — in Osaka, Japan, and Beijing. “Given that I do feel I’m a big-match player, there are some times when I play higher-ranked people and I don’t do that great,” said Osaka. “So I feel like this tournament is a big challenge for me. I think I’m not even really thinking of this tournament as the Finals, I’m just trying to continue on from where Beijing left off. Naomi Osaka extended her winning streak to 11 matches after defeating Petra Kvitova of the Czech Republic 7-6 (1), 4-6, 6-4 in the first of three round-robin matches on the day. The two-time Grand Slam champion failed to take advantage of two match points when serving at 5-2 in the third, but nailed down the victory on a third match point when serving in the 10th game. Kvitova surrendered the encounter when she sailed a backhand crosscourt wide on the final point. “I know how Naomi is playing, how confident she is from the past weeks when she played well in Asia,” Kvitova said. “So I did expect really tough match. The only other time Osaka played Kvitova took place when the Japanese player captured this year’s Australian Open final but a score of 7-6 (2), 5-7, 6-4.