Reuters) - Roger Federer and Serena Williams came through their first real tests at the U.S. Open on Saturday with flying colours as the casualty toll at the last grand slam of the year soared to record numbers.
The former world number ones both faced dangerous opponents but survived to fight another day, advancing safely to the fourth round at Flushing Meadows.
Their performances were not perfect but still sent an ominous warning to their younger rivals about their intentions to add to their stockpile of major championships.
“As long as I’m in the tournament I know I have a shot and that’s what it’s about right now,” said Federer, who beat Croatia’s Marin Cilic 6-3 4-6 6-4 6-2.
The Swiss master dropped a set for the first time in the tournament but was unfazed.
Williams beat fourth seed Victoria Azarenka of Belarus 6-1 7-6 but was running on empty by the end.
The pair had been drawn together much earlier than expected because Williams, who has only just returned from a long injury layoff, has slipped down the rankings and was seeded 28th.
The American raced through the first set in less than half an hour but began to tire in the second, failing to serve out the match as Azarenka forced the tiebreaker.
“I definitely wasn’t happy with the way I played overall today,” Williams said.
Federer will play unseeded Argentine Juan Monaco in the round of 16 on Monday, while Williams faces former French Open champion Ana Ivanovic after she beat American wildcard Sloane Stephens 6-3 6-4.
The two current world number ones, Novak Djokovic and Caroline Wozniacki, both breezed through with straight-set wins on the Arthur Ashe Stadium after overcoming minor problems.
Djokovic beat Nikolay Davydenko of Russia 6-3 6-4 6-2 while Wozniacki produced a methodical 6-2 6-4 victory over unseeded American Vania King.
Davydenko presented Djokovic with some problems early on but the top seed eventually worked him out and was glad to have been pushed.
“It’s the first test I think I had this tournament and it was expected,” Djokovic said.
Wozniacki struggled with her serve as the wind on the Arthur Ashe Stadium center court blew hard.
Wozniacki’s next opponent is Russia’s Svetlana Kuznetsova, the 2004 U.S. Open champion, who beat Akgul Amanmuradova of Uzbekistan 6-4 6-2.
Jelena Jankovic, a finalist at the U.S. Open three years ago, was bundled out 6-4 6-4 by Russia’s Anastasia Pavlyuchenkova.
She faces Francesca Schiavone of Italy next after last year’s French Open champion saved a match point in her 5-7 7-6 6-3 win over South Africa’s Chanelle Scheepers.
Maria Sharapova was knocked out of the U.S. Open on Friday by Italian Flavia Pennetta after the former champion’s notoriously shaky serve let her down when it mattered most. The Russian twice clawed her way back from a seemingly hopeless position to give herself the chance of winning when she threw it away, losing the third-round match 6-3 3-6 6-4.