Results in the Miami ATP and WTA hardcourt tournament on Tuesday

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Fourth Round

Second seed Roger Federer (Switzerland) beat Taylor Dent (US) 6-3, 6-2

Third seed Novak Djokovic (Serbia) beat Tomas Berdych (Czech Republic) 6-3, 6-2

10th seed Jo-Wilfried Tsonga (France) beat seventh seed Gilles Simon (France) 6-7 (4/7), 6-3, 6-2

Fourth seed Andy Murray (Britain) beat Viktor Troicki (Serbia) 6-1, 6-0

Eighth seed Fernando Verdasco (Spain) beat 18th seed Radek Stepanek (Czech Republic), 6-2, 6-2

Fifth seed Andy Roddick (US) beat ninth seed Gael Monfils (France) 7-6 (7/2), 6-4

Sixth seed Juan Del Potro (Argentina) beat 11th seed David Ferrer (Spain) 6-3, 6-2
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