Paris - Roger Federer reached the third round of Roland Garros for the 15th time on Wednesday to set-up a clash with Casper Ruud, the son of a player who featured in the 1999 French Open when the Swiss star made his debut.
Federer eased to a 6-4, 6-3, 6-4 win over German lucky loser Oscar Otte, the world number 144, to make the third round for the 15th time.
Next up for the third seed is a clash with Norway's Ruud who put out Italian 29th seed Matteo Berrettini 6-4, 7-5, 6-3.
Ruud's father Christian reached the third round of Roland Garros in 1999 when a 17-year-old Federer made his main draw debut.
Federer lost to Pat Rafter in his first round match.
According to the ATP, Christian Ruud's last career tournament was the 2001 French Open where he retired in the first round against Sargis Sargsian.
Had Ruud defeated Sargsian, he would have faced Federer in the second round.
Instead Federer came from two sets down to beat Sargsian 9-7 in fifth set to reach his first Grand Slam quarter-final.
Federer, playing in Paris for the first time since 2015 when he made the quarter-finals, hailed the fans on Court Philippe Chatrier, two of whom carried a bedsheet with 'Federer forever' painted on it.
"Thanks to the fans, a thousand times thanks."
Federer saved all four break points he faced against Otte.
"The Grand Slams are incredible. You can meet a player who qualified who (you) have not heard of before," said the 2009 champion.
"It was difficult, he really played a great match.
"Happily for me, he helped me with some mistakes at the end of the sets."
Results from the fourth day of the French Open on Wednesday (x denotes seeding):
Men
2nd round
Stefanos Tsitsipas (GRE x6) 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
Kei Nishikori (JPN x7) bt Jo-Wilfried Tsonga (FRA) 4-6, 6-4, 6-4, 6-4
Laslo Djere (SRB x31) bt Alexei Popyrin (AUS) 6-4, 7-6 (7/4), 6-4
Juan Ignacio Londero (ARG) bt Richard Gasquet (FRA) 6-2, 3-6, 6-3, 6-4
Corentin Moutet (FRA) bt Guido Pella (ARG x19) 6-3, 6-1, 2-6, 7-5
David Goffin (BEL x27) bt Miomir Kecmanovic (SRB) 6-2, 6-4, 6-3
Rafael Nadal (ESP x2) bt Yannick Maden (GER) 6-1, 6-2, 6-4
Women
2nd round
Sloane Stephens (USA x7) bt Sara Sorribes Tormo (ESP) 6-1, 7-6 (7/3)
Polona Hercog (SLO) bt Jennifer Brady (USA) 6-3, 6-7 (8/10), 6-4
Garbine Muguruza (ESP x19) bt Johanna Larsson (SWE) 6-4, 6-1
Elina Svitolina (UKR x9) bt Kateryna Kozlova (UKR) -- walkover
Marketa Vondrousova (CZE) bt Anastasia Potapova (RUS) 6-4, 6-0
Carla Suarez Navarro (ESP x28) bt Shelby Rogers (USA) 6-1, 6-7 (4/7), 6-3
Elise Mertens (BEL x20) bt Diane Parry (FRA) 6-1, 6-3
Anastasija Sevastova (LAT x12) bt Mandy Minella (LUX) 6-2, 6-4
Veronika Kudermetova (RUS) bt Zarina Diyas (KAZ) 7-5, 6-1
Kaia Kanepi (EST) bt Shuai Zhang (CHN) 6-7 (4/7), 6-0, 7-5
Petra Martic (CRO x31) bt Kristina Mladenovic (FRA) 6-2, 6-1
Karolina Pliskova (CZE x2) bt Kristina Kucova (SVK) 6-2, 6-2