PARIS (AP) — Grand Slam winners Elena Rybakina and Aryna Sabalenka reached the fourth round of the French Open in straight sets on Saturday. The 2022 Wimbledon champion Rybakina, seeded fourth, beat Elise Mertens of Belgium 6-4, 6-2. Two-time Australian Open champion Sabalenka followed her on Court Philippe Chatrier and won 7-5, 6-1 against Paula Badosa. “It’s tough to play your best friend,” Sabalenka said. It certainly was for a while. After trailing 5-3 in the first set, Sabalenka won eight straight games to take complete control. “I was just feeling myself and trusting my shots,” Sabalenka said. The former No. 1-ranked Sabalenka’s best performance at Roland Garros is reaching the semifinals while Rybakina — the only player from Kazakhstan to win a major title — has one quarterfinal appearance here. Rybakina dropped her serve in the seventh game of the first set but broke straight back to tie her match at 4-4.