Roddick and Berdych are out. Those are probably the biggest upsets of the day. Del Potro is really looking great. His match against Kohlschreiber is the tournament's thriller so far, going 7-6 (7-3) 7-6 (9-7).
Djokovic destroyed his countryman, Troicki, 6-0 6-1.
Karlovic moves on too.
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