Andy Roddick reached the quarterfinals at the Miami masters tournament by beating Benjamin Becker 7-6 (4), 6-3.

Seeded sixth, Roddick improved to 23-4 this year, and he leads the men's tour in wins. He's seeking his first Miami title since 2004 and hoping to spoil a potential showdown Sunday between Roger Federer and Rafael Nadal.

Three-time champion Venus Williams became the first women's semifinalist by beating No. 6 seed Agnieszka Radwanska 6-3, 6-1.

Roddick rallied on the strength of his dominating serve. He dug out of a 1-4, love-40 hole in the first set and won 34 of his final 39 service points, including all six in the tiebreaker.

Andy Roddick of the U.S. returns a shot to Germany's Benjamin Becker during their match at the Sony Ericsson Open tournament in Key Biscayne, Florida, March 30, 2010

A big serve helps, too. When Roddick found himself in another hole serving at 4-5, love-30, he responded with three service winners and an ace.

Roddick made another one on match point, closing out the victory with his seventh ace of the match and his 343rd of the year, second-most on the tour.

Roddick has been broken only once through three matches and next plays No. 33 seed Nicolas Almagro, who eliminated No. 27 Thomaz Bellucci 6-4, 3-6, 7-6 (3).

Top-ranked Serena has been sidelined by a knee injury since winning the Australian Open in January. In her absence, Venus has become the woman to beat as she bids for her fourth Miami title and her first since 2001.

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