Second-ranked Aryna Sabalenka matched her career-best 15 straight wins after beating Madison Keys 6-4, 6-3 to advance to the quarterfinals of the China Open on Wednesday. The three-time Grand Slam winner started her streak with a title at Cincinnati in August and continued with a run to the championship at the U.S. Open last month. “When you’re able to sacrifice a lot and you’re able to work hard and you’re able to get these wins, that’s the best feeling,” Sabalenka said.