SHANGHAI - World number one Roger Federer got his quest for a fourth Tennis Masters Cup title back on track with a 6-4 6-3 win over Russian Nikolay Davydenko on Wednesday.

Following Federer on court, American Andy Roddick became the first player to book a semi-final spot at the season-ending event in Shanghai after crushing Chile's Fernando Gonzalez 6-1 6-4.

Roger Federer of Switzerland, left, and Russian Nikolay Davydenko, right, pass each other before the start of their match for the 2007 Tennis Masters Cup Shanghai Wednesday Nov. 14, 2007 in Shanghai, China. Federer beat Davydenko 6-4, 6-3. [Agencies] Federer, stunned by Gonzalez in his Red Group opener on Monday, was again below his best but he was still good enough to eliminate Davydenko from the showcase eight-man tournament.

"It was a different situation coming back from losing," shrugged the Swiss, who had never lost a round-robin match at the Masters Cup before being ambushed by Gonzalez.

"Here you lose and you play another top 10 guy. This was a top-four guy so it doesn't get any easier. Anything can happen in the men's game.

"You're a little bit off, you're a little bit tired, you'll lose right away. But I create myself many, many opportunities so eventually I'll break through and I'll break their will."

Federer, who owns a 14-1 record against Roddick, must now beat the American in his final group match on Friday to avoid an early exit from the $4.45 million event.

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