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Roger Federer, playing the second match of his French Open comeback, beat German lucky loser Oscar Otte in straight sets. Clive Brunskill/Getty Images Europe/Getty Images
Otte had never won a grand slam match before this week. But at times he tested the 20-time grand slam winner. Clive Brunskill/Getty Images Europe/Getty Images
Breaking late in each set was the key for Federer, who was never broken himself. Clive Brunskill/Getty Images
11-time champion Rafael Nadal faced another German who played qualifying, Yannick Maden. PHILIPPE LOPEZ/AFP/AFP/Getty Images
Nadal breezed through the first two sets before a tougher third set. Clive Mason/Getty Images
Maden broke Nadal twice in the third set but the Spaniard still advanced in straight sets. Clive Mason/Getty Images Europe/Getty Images
Women's contender Kiki Bertens had to retire in the first set Wednesday against Viktoriya Kuzmova due to illness. KENZO TRIBOUILLARD/AFP/AFP/Getty Images
Stefanos Tsitsipas made the third round at the French Open for the first time by defeating Hugo Dellien in four sets. Adam Pretty/Getty Images Europe/Getty Images
Last year's finalist, Sloane Stephens, had a big lead against Sara Sorribes Tormo then edged a tight second set to prevail 6-1 7-6. Clive Mason/Getty Images Europe/Getty Images
And in a battle of former grand slam finalists, Kei Nishikori (right) beat home hope Jo-Wilfried Tsonga in four sets. Clive Brunskill/Getty Images Europe/Getty Images
