Former champion Roger Federer and 11-time winner Rafael Nadal moved into the third round of the French Open at Roland Garros without dropping a set.

Federer, the 2009 champion, needed only 96 minutes to see off Germany's lucky loser Oscar Otte.

The Swiss third seed, playing in the tournament for the first time since 2015, beat the world 144 6-4 6-3 6-4.

Defending champion Nadal eased to a 6-1 6-2 6-4 win over Germany's world number 114 Yannick Maden.

It was difficult, he really played a great match - Federer

Otte held his serve in his opening four services games but was broken in his fifth as Federer took the opening set.

The 37-year-old then took control to move two sets ahead and a break in the ninth game of the third set gave him the opportunity to clinch an assured victory on his serve.

Otte had lost in the third qualifying round but took his place in the main draw as a 'lucky loser' because of withdrawals.

"The Grand Slams are incredible. You can meet a player who qualified who you have not heard of before," said Federer, who had to save four break points on his serve.

"It was difficult, he really played a great match. Happily for me, he helped me with some mistakes at the end of the sets."

Next up for Federer is a match against Norway's Casper Ruud who knocked out Italian 29th seed Matteo Berrettini 6-4 7-5 6-3.

Nadal won the first five games of the match on his way to taking the opening set in 42 minutes and then broke 29-year-old Maden's serve in the opening service game of the second.

Maden, playing in the second round of a Grand Slam for the first time, managed to break Nadal's serve twice in the third set, but struggled to hold on to his own serve as the second seed moved into the last 32.

He is the second German qualifier that Nadal has defeated at this year's French Open after his first-round win over Yannick Hanfmann on Monday.

Nadal will now face Belgium's David Goffin in round three.

Tsitsipas, Nishikori & Wawrinka all advance

Elsewhere, sixth seed Stefanos Tsitsipas of Greece fought back from a set down to beat Bolivia's Hugo Dellien 4-6 6-0 6-3 7-5.

Kei Nishikori, seeded seventh, also suffered a scare in his match against France's Jo-Wilfried Tsonga.

Two-time French Open semi-finalist Tsonga won the opening set but the Japanese player came back to win 4-6 6-4 6-4 6-4.

Former champion Stan Wawrinka won in straight sets, overcoming Chile's Cristian Garin 6-1 6-4 6-0.

The Swiss will play either Bulgaria's Grigor Dimitrov or former US Open winner Marin Cilic next.

Meanwhile, France's Corentin Moutet, the world's number 110, defeated Argentina's 19th seed Guido Pella 6-3 6-1 2-6 7-5.