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PARIS, May 29-- Tennis legends Rafael Nadal and Roger Federer moved a step further towards their potential semifinal clash in men's singles, while fourth-seeded Kiki Bertens had to retire from women's singles second round citing illness here on Wednesday. Nadal eased past Germany's Yannick Maden 6-1, 6-2, 6-4, setting up a third round clash with No. 27 seed David Goffin. "In the third set, I lost a little bit concentration and intensity. Then all the match became difficult," Nadal told a press conference. "The positive thing is every time that I had the mistake, then I had the break again, and that's good news." Federer also notched a comfortable victory, as the 20-time Grand Slam winner beat another German player Oscar Otte 6-4, 6-3, 6-4. Greek sixth-seeded talent Stefanos Tsitsipas and No. 7 seed Kei Nishikori of Japan had to recover from one set down to overcome their respective opponents for the third round. Grigor Dimitrov underwent a five-set thriller to see off 11th-seeded Marin Cilic 6-7 (3), 6-4, 4-6, 7-6 (2), 6-3. Bertens hoped to build on her recent momentum on clay for Roland Garros title contention, but that was ended by unexpected illness as she had to retire trailing at 1-3 in the opening set. "This morning I woke up at 3:00, and then I felt really sick. Vomiting, diarrhea all night long and all day long," Bertens explained. "I felt a little bit better before the match. I just wanted to give it a try, but then as soon as I start warming up right before the match, it started again," she said, adding that "there was not any energy left." | 
