Switzerland's Roger Federer, the world No. 2, defeated France's Gilles Simon 6-1, 4-6, 2-6, 6-2, 6-3 Sunday in the 4th round of the French Open.
The 31-year-old Federer needed two hours and 59 minutes to put away the 28-year-old Simon.
The Swiss great's opponent in the quarterfinals will be France's Jo-Wilfried Tsonga, the No. 6 seed, who knocked off Serbia's Viktor Troicki 6-3, 6-3, 6-3.
Tsonga, who has not dropped a set during the tournament, played before a crowd that included actor Leonardo Di Caprio and Paris Saint-Germain president and former tennis player Nasser Al-Khelaifi.
He is trying to become the first Frenchman since Yannick Noah in 1983 to win at Roland Garros.
In other men's action, Spain's David Ferrer crushed South Africa's Kevin Anderson 6-3, 6-1, 6-1, while Spain's Tommy Robredo beat countryman Nicolas Almagro 6-7 (5-7), 2-6, 6-4, 6-4, 6-4.
Ferrer will play Robredo in the quarterfinals.
On the women's side, American Serena Williams, the world No. 1, rolled over Italy's Roberta Vinci 6-1, 6-3 in 70 minutes.
Williams, who has not won at Roland Garros since 2002, will play Russia's Svetlana Kuznetsova, the 2009 champion and a finalist in 2006, next.
Kuznetsova beat Germany's Angelique Kerber, the No. 8 seed, 6-4, 4-6, 6-3.
Italy's Sara Errani, the No. 5 seed and a finalist last year, beat Spain's Carla Suarez Navarro 5-7, 6-4, 6-3.
The French Open is the second Grand Slam event of the tennis season and the only one played on red clay, the game's slowest surface. EFE