The usual stroll for King Nadal

The usual stroll for King Nadal

HARD DAY: Greece’s Stefanos Tsitsipas celebrates after beating Bolivia’s Hugo Dellien on Wednesday. AFP

Roger Federer breezed into the third round of the French Open for the 15th time on Wednesday by seeing off German lucky loser Oscar Otte, while 11-time champion Rafael Nadal and Stefanos Tsitsipas also progressed, but women’s contender Kiki Bertens retired with illness.

The 37-year-old Federer held off a persistent world number 144 Otte, saving all four break points he faced in a 6-4, 6-3, 6-4 win on Court Philippe Chatrier.

Next up for the 20-time Grand Slam title winner is a clash with Norway’s Casper Ruud who put out Italian 29th seed Matteo Berrettini 6-4, 7-5, 6-3.

Nadal continued the strong start to his bid for a record-extending 12th title with a comfortable 6-1, 6-2, 6-4 victory over German qualifier Yannick Maden.

The 17-time major champion will play Belgian 27th seed David Goffin in the last 32.

Dutch women’s fourth seed Kiki Bertens retired from her match with Viktoria Kuzmova with illness while trailing 3-1, 40-15.

The 27-year-old complained of shaking and a lack of energy before calling it quits, leaving Kuzmova with a third-round clash against either Britain’s Johanna Konta or American Lauren Davis.

Greek star Tsitsipas did not have things all his own way against Bolivia’s Hugo Dellien on Court Simonne Mathieu, but managed to grind out a 4-6, 6-0, 6-3, 7-5 victory on his fourth match point.

The sixth seed will take on Serbia’s Filip Krajinovic in his maiden appearance in the third round.

Elsewhere on Wednesday, Stan Wawrinka showed that he can not be ruled out of contention with an impressive 6-1, 6-4, 6-0 success against Chilean Cristian Garin.

The Swiss will play Bulgaria’s Grigor Dimitrov next, after the former world number three beat 11th seed Marin Cilic in a marathon encounter 6-7 (3/7), 6-4, 4-6, 7-6 (7/2), 6-3.

Ukrainian Elina Svitolina will face 2016 champion Garbine Muguruza in the third round after the ninth seed’s compatriot Kateryna Kozlova pulled out before their match with a viral infection. Spain’s Muguruza eased to a 6-4, 6-1 victory over Swede Johanna Larsson to advance.

Second seed Karolina Pliskova also clinched a straight-sets win in round two, beating Slovakia’s Kristina Kucova 6-2, 6-2 to set up a tie with Croatian 31st seed Petra Martic.

Sloane Stephens cruised through with a 6-1, 7-6 (7/3) win over Sara Sorribes Tormo on Court Philippe Chatrier.

The former US Open champion will play Slovenia’s Polona Hercog next after she edged out American Jennifer Brady 6-3, 6-7 (8/10), 6-4.

Second round results (prefix denotes seeding): Men’s singles: 3-Roger Federer (SUI) bt Oscar Otte (GER) 6-4, 6-3, 6-4; 6-Stefanos Tsitsipas (GRE) bt Hugo Dellien (BOL) 4-6, 6-0, 6-3, 7-5; Nicolas Mahut (FRA) bt Philipp Kohlschreiber (GER) 6-3, 6-3, 6-3; 7-Kei Nishikori (JPN) bt Jo-Wilfried Tsonga (FRA) 4-6, 6-4, 6-4, 6-4; 27-David Goffin (BEL) bt Miomir Kecmanovic (SRB) 6-2, 6-4, 6-3; 2-Rafael Nadal (ESP) bt Yannick Maden (GER) 6-1, 6-2, 6-4.

Women’s singles: 7-Sloane Stephens (USA) bt Sara Sorribes Tormo (ESP) 6-1, 7-6 (7/3); 19-Garbine Muguruza (ESP) bt Johanna Larsson (SWE) 6-4, 6-1; 2-Karolina Pliskova (CZE) bt Kristina Kucova (SVK) 6-2, 6-2; Viktoria Kuzmova (SVK) bt 4-Kiki Bertens (NED) 3-1 retired.