Swiss Roger Federer and Juan Martin del Potro from Argentina are in the midst of a tight match this afternoon for the championship of the U.S. Open 2009.

Federer won the first set 6-3 in the first 40 minutes of the match. After 2 hours of action, the crowd at the Arthur Ashe Stadium got involved in the game when Del Potro won the second set 7-6 showing a potent forehand capable of beating the World's No. 1 player.

The match could become the first Grand Slam championship for Del Potro and at the same time, the sixth straight U.S. Open win for Federer.

Click here for the live streaming online at the U.S. Open website.