London - Stanislas Wawrinka defeated David Ferrer 6-7 (3/7), 6-4, 6-1 on Friday to
keep alive his hopes of making the last four of the ATP World Tour Finals.
A Nadal loss would give Berdych a spot in the final four alongside the
Spanish world number one.
Results from the fifth day of the ATP World Tour Finals at London's O2 Arena on Friday (x denotes seeding):
Stanislas Wawrinka (SUI x3) bt David Ferrer (ESP x7) 6-7 (3/7), 6-4, 6-1
Marcel Granollers/Marc Lopez (ESP/ESP x4) bt Leander Paes/Radek Stepanek (IND/CZE x7) 4-6, 7-6 (7/5), 10-8 (match tie-break)