Paris - Novak Djokovic and Roger Federer have passed tough four-set tests to reach the French Open last-16 on Friday where they were joined by where they were joined by outspoken Ernests Gulbis who found himself accused of sexism.
Second seed Djokovic, the 2012 runner-up, stretched his career streak over Croatia's 25th seed Marin Cilic to 9-0 after a topsy-turvy 6-3, 6-2, 6-7 (2/7), 6-4 win.
Djokovic, the 2012 runner-up, next faces French 13th seed Jo-Wilfried Tsonga who beat Poland's 22nd seed Jerzy Janowicz 6-4, 6-4, 6-3 for a place in the quarter-finals after seeing off Cilic who allowed 22 break points and committed 64 unforced errors.
A pulsating encounter on Suzanne Lenglen court ended when Cilic, rattled by a shout from the crowd, served up his fifth double fault.
"Marin is a tough player with plenty of strengths," said Djokovic. "He is a great guy with lots of qualities.
"Physically I had to work very hard, because he was very aggressive, and I could expect that. I came into the match knowing that he's going to take his chances."
Federer, the fourth seeded 2009 champion, needed more than three hours to record his fifth win in five meetings against Russian Dmitry Tursunov who twice needed treatment on a leg injury.
His 7-5, 6-7 (7/9), 6-2, 6-4 win also gave him a fourth round spot for the 12th time beating the previous record of 11 set by Guillermo Vilas.
Federer, the 17 time major winner, next faces Gulbis who reached the last 16 for the first time since 2008.
"It was tough to lose the second set but nice to win the match," said 32-year-old Federer, who is contesting his 58th straight Grand Slam.
"It was not a straightforward win. I knew Dmitry would try different things, take big cuts at the ball but I am pleased to have played solid."
Gulbis, the 18th seed, won a fractious third round clash against 35-year-old Czech Radek Stepanek 6-3, 6-2, 7-5 in the Court One bullring, firing 19 aces and 45 winners.After the match, Gulbis caused a stir by claiming tennis is no place for female players.
"A woman needs to enjoy life a little bit more. Needs to think about family, needs to think about kids. What kids you can think about until age of 27 if you're playing professional tennis, you know," said the 25-year-old.
Gulbis, whose last fourth round appearance at a major came in 2008 when he made the quarter-finals in Paris, insists he already has a game plan to tackle Federer.
"You don't need to be scared to do certain things against him, because most of the people they go on the court and they lose already before it has started," said the 18th seed. "I can tell you that's not gonna be the case with me."
Milos Raonic became the first Canadian man in history to reach the last 16 at Roland Garros.
The 23-year-old number eight seed defeated France's 29th seed Gilles Simon 4-6, 6-3, 2-6, 6-2, 7-5 in a match which ended in the gloom at 2130 local time (1930GMT).
Raonic will face either Martin Klizan of Slovakia or Spain's Marcel Granollers for a place in the quarter-finals.
Granollers was ahead two sets to one when play was called off for the night.
American 10th seed John Isner made the last 16 for the first time with a 7-6 (15/13), 7-6 (7/3), 6-7 (5/7), 7-5 win over Spanish 17th seed Tommy Robredo on the back of 77 winners and 17 aces balanced out by 74 unforced errors.
Isner, who has now played eight tiebreaks in 11 sets so far, carved the only break on Friday in the 11th game of the fourth set.
Isner is the first American in the last 16 since Robby Ginepri in 2010 and with Jack Sock and Donald Young still to play, the US could have three men in the fourth round for the first time since 1995.
Isner next faces Czech sixth seed Tomas Berdych, a semi-finalist in 2010, who beat Spain's Roberto Bautista Agut 6-1, 6-2, 6-7 (4/7), 6-4.
Results on Friday at
the French Open, the sixth day of the season's second Grand Slam
tournament at Roland Garros (x denotes seeded player):
Tomas Berdych (CZE x6) bt Roberto Bautista Agut (ESP x27) 6-1, 6-2, 6-7 (4/7), 6-4
John Isner (USA x10) bt Tommy Robredo (ESP x17) 7-6 (15/13), 7-6 (7/3), 6-7 (5/7), 7-5
Ernests Gulbis (LAT x18) bt Radek Stepanek (CZE) 6-3, 6-2, 7-5
Roger Federer (SUI x4) bt Dmitry Tursunov (RUS x31) 7-5, 6-7 (7/9), 6-2, 6-4
Milos Raonic (CAN x8) bt Gilles Simon (FRA x29) 4-6, 6-3, 2-6, 6-2, 7-5
Jo-Wilfried Tsonga (FRA x13) bt Jerzy Janowicz (POL x22) 6-4, 6-4, 6-3
Novak Djokovic (SRB x2) bt Marin Cilic (CRO x25) 6-3, 6-2, 6-7 (2/7), 6-4
Garbine Muguruza (ESP) bt Anna Schmiedlova (SVK) 6-2, 6-4
Pauline Parmentier (FRA) bt Mona Barthel (GER) 1-6, 6-1, 7-5
Samantha Stosur (AUS x19) bt Dominika Cibulkova (SVK x9) 6-4, 6-4
Maria Sharapova (RUS x7) bt Paula Ormaechea (ARG) 6-0, 6-0
Ajla Tomljanovic (CRO) bt Agnieszka Radwanska (POL x3) 6-4, 6-4
Carla Suarez Navarro (ESP x14) bt Taylor Townsend (USA) 6-2, 6-2
Eugenie Bouchard (CAN x18) bt Johanna Larsson (SWE) 7-5, 6-4
Angelique Kerber (GER x8) bt Daniela Hantuchova (SVK x31) 7-5, 6-3