Federer, Roddick post Day-4 wins in Shanghai

Shanghai, China (Sports Network) - World No. 1 Swiss Roger Federer and former top-ranked American star Andy Roddick were Wednesday's Red Group round- robin winners at the exclusive $3.7 million Tennis Masters Cup. Roddick has already clinched a berth in Saturday's semifinals here.
The top-seeded Federer rebounded from a Monday loss against Fernando Gonzalez by whipping fourth-seeded Russian Nikolay Davydenko 6-4, 6-3, while a fifth- seeded Roddick improved to 2-0 this week by handling a seventh-seeded Gonzalez 6-1, 6-4 on the hardcourt at Qi Zhong Stadium. Roddick moved to 7-3 lifetime versus the Australian Open runner-up Gonzalez.
Federer got past Davydenko in 1 hour, 26 minutes with the help of four service breaks, compared to two for the Russian, while Roddick doused "Gonzo" in 1 hour, 5 minutes by winning 21 more points (59-38) than his Chilean counterpart. The massive-serving American, who fired only four aces in the big win, also broke Gonzalez three times, while the Chilean failed to record one break in the setback.
The amazing Federer is now 16-1 all-time in his Masters Cup round-robin matches and 11-0 lifetime versus Davydenko, who succumbed to the super Swiss in this year's U.S. and French Open semifinals.
Roddick currently leads the Red Group here with his 2-0 record, while Federer and Gonzalez are 1-1 and Davydenko is 0-2 and out of contention for Saturday's semis.
Federer and Roddick will clash here on Friday, while Gonzalez will take on Davydenko on Day 6.
Sixth-seeded Spaniard David Ferrer leads this week's Gold Group with a perfect 2-0 record, while second-seeded Spaniard Rafael Nadal and eighth-seeded Frenchman Richard Gasquet are both 1-1 and third-seeded Serbian Novak Djokovic has already been eliminated from semifinal contention at 0-2. Nadal is the reigning French Open champ and Wimbledon runner-up, while Djokovic was the U.S. Open runner-up to Federer in September.
The 12-time major champion Federer will finish the year at No. 1 for a fourth straight year. The sublime Swiss is the reigning U.S. Open, Wimbledon, Aussie Open and Masters Cup titlist and French Open runner-up. He defeated American James Blake in last year's finale here in Shanghai and is seeking his fourth Masters Cup title in five years.
On Thursday, Nadal will face Djokovic and Ferrer will battle Gasquet to determine the semifinalists from the Gold Group.
The Masters Cup features round-robin action for the first six days, with the top-two players from each group advancing to the semis. The lucrative final will be staged here on Sunday.
An undefeated champion, which at this point could only be Roddick or Ferrer, in Shanghai would collect over $1.5 million.