Juan Monaco of Argentina upset the American Andy Roddick as he beat him 7-5 6-0 in the fourth round of the Sony Ericsson Open in Miami.
It was a surprising defeat for the 31st seed Roddick, who beat the 16 times Grand Slam champion Federer in the round before.
Roddick was the first player to secure a break as he took Monaco’s serve to go 4-3 up in the first set. But the 21st seed Argentine managed to break back at from 5-5 it was all about Monaco. Roddick couldn’t cope physically and producing 37 unforced errors to only 8 winners, he lost the match in straight sets.
Monaco will face Mardy Fish in the quarters, who defeated the Spaniard Nicolas Almagro 6-3 6-7 (2) 6-3.
The no.5 seed David Ferrer cruised through the quarterfinals as he beat the no.11 seed Juan Martin del Potro of Argentina surprisinly easily 6-3 6-3.
Ferrer played a very solid match against a visibly frustrated Del Potro and set up a clash against the defending champion Djokovic.