The withdrawal of Flavia Pennetta allowed US Open top seed Caroline Wozniacki to reach the last four of the Pilot Pen Tennis without playing in New Haven, Connecticut.

Top seed Andy Roddick fought back from a set down to win his SAP Open semi-final and set up a meeting with second seed Fernando Verdasco in San Jose.

Three-time Australian Open champion Roger Federer headed the list of seeded players to safely make it through to the third round on day four at Melbourne Park.