World number one Roger Federer survived an inconsistent form to beat Florent Serra 7-6 (7-2), 7-6 (7-3) on Monday in the third round of the WTA and ATP tournament in Miami, the United States.

Federer lost serve three times, each time when he led. He committed 35 unforced errors to 32 for Serra.

But Federer won eight consecutive service points in the tiebreakers and closed out the victory with a service winner.

Switzerland's Roger Federer returns a shot to France's Florent Serra during their match at the Sony Ericsson Open tennis tournament in Key Biscayne, Florida, March 29, 2010

The top-seeded woman, Svetlana Kuznetsova, was hampered by a right shoulder injury and lost to Marion Bartoli 6-3, 6-0 in the fourth round.

Kuznetsova, the 2006 champion, required treatment from a trainer three times during the match and won only eight points in the second set.

Mardy Fish reached the fourth round with his second consecutive win over a seeded opponent, beating No. 29 Feliciano Lopez 7-5, 6-3. Fish upset defending champion Andy Murray in the second round.

【体坛英语资讯：Federer beats Serra to reach fourth round in Miami】相关文章：

★ 体坛英语资讯：USA, France and Argentina cruise into Davis Cup last 8

★ 体坛英语资讯：Bielsa comes back to take charge of Chile

★ 体坛英语资讯：Torres and Gerrard hand Liverpool win over Shanghai

★ 娱乐英语资讯：Parker is no fashionista

★ 体坛英语资讯：Denmark coach appologizes for impolite behavior

★ 体坛英语资讯：China, Indonesia share light at badminton worlds

★ 体坛英语资讯：Liu begins training in isolation

★ 体坛英语资讯：Liu starts from scratch to prepare for 2008

★ 体坛英语资讯：NBAs spectacular China games just the tip-off

★ 娱乐英语资讯：Jennifer Aniston tops US magazine cover face list