Sixth seeded Djokovic continued Serbia's French Open surge when he defeated unseeded Spaniard Fernando Verdasco 6-3, 6-3, 7-6 (7/1) to reach his second successive quarterfinal.

Thirty-year-old Moya, the 23rd seeded Spaniard and the winner here in 1998, set up a last eight clash with defending champion Rafael Nadal by defeating 35-year-old Jonas Bjorkman of Sweden 7-6 (7/3), 6-2, 6-4.

Nadal once again proved too good for Australia's Lleyton Hewitt as he completed a 6-3, 6-1, 7-6 win over the veteran in less three hours.

In another match, unseeded Russian Igor Andreev defeated Marcos Baghdatis of Cyprus 2-6, 6-1, 6-3, 6-4 to advance to the quarters where he will meet Djokovic.

Djokovic will be the third Serb to feature in the last eight with compatriots Jelena Jankovic and Ana Ivanovic already in the quarterfinals of the women's singles.

After struggling to impress in his first matches, Djokovic, who needed over four hours to see off French wildcard Olivier Patience in the third round, clicked into top gear against Verdasco.

"I'm really happy with the way I played because I didn't play very well at all in the first three rounds," said Djokovic.

Verdasco battled gamely in the third set with Djokovic fending off break points in the fifth and seventh games and the Spaniard forced the tiebreak.

A lucky netcord gave the Serb a 4-1 lead in the breaker which became 5-1 with a brutal forehand drive.

A double fault handed Djokovic five match points and he wrapped up the 2hr 45min match when Verdasco ballooned a forehand.

Moya, who played his first Roland Garros in 1996, could face close friend Nadal, nine years his junior, in the last eight.

Moya was put under pressure early on by the unseeded Bjorkman, who at 35 years old was the oldest player in the men's draw this year.

The Swede broke Moya's serve in the second game mixing his looping baseline shots with the occasional venture to the net and he got to 5-2.

The Spaniard though started to open up with his trademark big forehand and he won four games in a row with two breaks of serve to move 6-5 up.

Bjorkman forced the tie-break and was 5-3 up before Moya gathered his forces again winning four points in a row to take the set.

Two more breaks of serve in the sixth and eighth games gave Moya the second set comfortably and Bjorkman needed treatment for a shoulder injury at the next break.

Last year's Wimbledon semifinalist then forced Moya to save six break points in a marathon third game of the third set.

But then Bjorkman struggled on his own following serve allowing Moya to break for a 3-1 lead.

It looked like Moya was home and dry at that point but Bjorkman refused to capitulate and a break of serve in the next game allowed him to level at 3-3.

Games went with serve after that until the 12th game when Moya forced the pace on return of serve and Bjorkman cracked hitting a weak backhand into the net on match point.

Earlier on Sunday, Federer enjoyed a 7-6 (7/3), 6-4, 6-4 victory over Russia's Mikhail Youzhny to reach the quarterfinals where he takes on Spain's Tommy Robredo. In the battle of the Argentinians, Canas saw off Juan Monaco to reach his third Roland Garros quarterfinals to face Nikolay Davydenko.