Tomas Berdych advanced to the quarter-finals of the Miami Masters as Gael Monfils was forced to retire from their fourth-round match this afternoon.
The eighth seed was a set up and had just broken to lead 3-2 in the second when Monfils threw in the towel following an awkward fall.
Berdych won the first set 6-3 after snatching the only break of serve in a set that he dominated.
The Czech will next face either Juan Monaco or 26th seed Fernando Verdasco in the last eight.
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