Stanislas Wawrinka enjoyed a memorable debut match at the World Tour Finals, defeating Tomas Berdych 6-3, 6-7, 6-3.  At 28 years old, Wawrinka has had the best year of his career, and is now 1-0 Group A.  With world number one Rafael Nadal likely to grab first in the group, Wawrinka’s match against David Ferrer may be key.

In Group B action, Juan Martin Del Potro began with a thrilling comeback 6-7, 6-3, 7-5 victory over Richard Gasquet, appearing for the first time since 2007.  Roger Federer and Novak Djokovic are also in the group, considered the “Group of Death”, so it was crucial for Del Potro to get off to a good start in his most winnable match.