PARIS - Novak Djokovic and Roger Federer passed tough four-set tests on Friday to reach the French Open last 16 where they were joined by outspoken Latvian Ernests Gulbis.
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 either French 13th seed Jo-Wilfried Tsonga or Poland's Jerzy Janowicz, the 22nd seed, for a place in the quarter-finals after seeing off Cilic who allowed 22 break points on his serve 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. We've been friends for many years."
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."