Roger Federer reached the fourth round of the Sony Ericsson Open

Roger Federer reached the fourth round of the Sony Ericsson Open in Miami, but was made to sweat by Frenchman Florent Serra.

The top seed won 7-6 (7/2) 7-6 (7/3) in one hour 32 minutes to set up a meeting with Tomas Berdych of the Czech Republic.

The Swiss star dropped his serve three times, but converted three of the eight break-point chances he had, including two in the second set, and held his serve when it counted.

Serra was let down by his first serve, making just 49%, but Federer will also look to improve on his mark of 58% in the next round.

Berdych, the 16th seed, was a 6-4 7-5 winner over Horacio Zeballos of Argentina.

A single break gave Berdych the first set and two more followed in the second, Zeballos claiming one of his own.

American Mardy Fish, Andy Murray’s conqueror, claimed another scalp with a 7-5 6-3 win over 29th seed Feliciano Lopez.

Fish carved out 13 break points, converting just two, but saved the two he faced to claim victory.

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