Stanislas Wawrinka qualify for semifinals at ATP World Tour semifinals . Rafael Nadal completed a perfect sweep of his matches in Group A of the ATP World Tour Finals by beating Tomas Berdych Friday -- his victory enabling a grateful Stanislas Wawrinka to accompany him into the semifinals in London . Beats David Ferrer in three sets in Group A. Rafael Nadal 's win over Tomas Berdych seals Wawrinka 's semifinal . No.1 seed has to get past Berdych in three sets .
Stanislas Wawrinka qualify for semifinals at ATP World Tour semifinals . Beats David Ferrer in three sets in Group A. Rafael Nadal 's win over Tomas Berdych seals Wawrinka 's semifinal . No.1 seed has to get past Berdych in three sets .