Wawrinka qualifies for semifinals at ATP World Tour semifinals . Nadal , who has never won the end of season showpiece , waited until the eighth game of the decider to make the breakthrough , taking advantage of two double faults by fifth seed Berdych . Beats Juan Martin Del Potro in three sets in ATP World Tour win over Tomas Berdych seals Wawrinka 's passage . No.1 ATP World Tour has to battle past London in three sets .
Wawrinka qualifies for semifinals at ATP World Tour semifinals . Beats Juan Martin Del Potro in three sets in ATP World Tour win over Tomas Berdych seals Wawrinka 's passage . No.1 ATP World Tour has to battle past London in three sets .