Germany’s Tommy Haas is determined to produce one of the biggest upsets in Wimbledon history as he takes on five-time champion and top-seed Roger Federer in the tournament’s semifinals.

The 31 year-old from Hamburg has not lost on grass this season and he could become the first German in a Wimbledon men’s singles final since Boris Becker in 1995. Although Federer leads Haas 11-3 in their meetings last time they played, the 34th seed took Roger to five sets, winning the first two. So, expect today’s match to be a close one.

The game starts at 13:00 London (08:00 ET).

UPDATE: Roger Federer reached a record 20th Grand Slam final and a seventh straight Wimbledon title match with a 7-6 (7/3), 7-5, 6-3 win over Tommy Haas.

Watch: Wimbledon 2009 Finals – Federer vs Roddick