Federer is looking for his 11th title of the year

The world number one, seeking to win his home-town event for the first time, took just 52 minutes to win.

Second seed David Nalbandian and third seed and defending champion Fernando Gonzalez both had to save match points to reach the last eight.

Nalbandian edged out Feliciano Lopez while Gonzalez saw off Mardy Fish.

Nalbandian, who could clinch his place in the Masters Cup if he reaches the final in Basle, saw off Spaniard Lopez 6-7 (4-7) 6-3 7-6 (9-7).

The Argentine now faces Tim Henman's conqueror Stanislaw Wawrinka.

I'm playing unbelievable right now Roger Federer

Chilean Gonzalez survived six match points to beat American Fish.

Fish led 6-2 in the third-set tie-break but faltered before double-faulting at match point down to hand the third seed a 6-7 (5-7) 6-4 7-6 (10-8) win.

Gonzalez is also one of the players in contention for the four remaining spots at the season-ending Masters Cup.

Ninth seed Juan Ignacio Chela was beaten by Thai Paradorn Srichaphan.

But seventh seed Jose Acasuso went through, beating Philipp Kohlschreiber 7-6 (7-1) 6-1 to book his spot in the quarter-finals.

Fifth seed David Ferrer will be Federer's next opponent - the Spaniard beat Czech player Jiri Novak in three sets.

Federer, looking for his 11th title of the season, admitted he felt motivated at the prospect of winning in front of his home crowd.

"I'm playing unbelievable right now," said the Swiss player after his 21st consecutive victory. "The stadium inspired me."