Roger Federer, 28 the world's No.1 player and Juan Martin del Potro, 20 will fight for the U.S. Open 2009 Championship Monday afternoon at the Arthur Ashe Stadium in New York.

Federer described Del Potro as good and dangerous at the same time. He is going to give all he has, Federer told CBSNews just before the beginning of the final. 

The match is scheduled for 4:00 pm EST, could mean the sixth consecutive U.S. Open title for Federer or the first Grand Slam victory for Argentinean Del Potro. It will be live streamed online and broadcast by CBS.

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

Critics believe Del Potro at 6 ft 6 inches high could have a strong service to overcome that of Federer's. But the Swiss top seeded is also acknowledged as one of the most dominant servers on tour.

Experience appears to be also a factor for this match. While Federer turned professional in 1998 and has played 9 U.S. Open tournaments, Del Potro, has played only three U.S. Open tournaments and became pro in 2005, according to the U.S. Open site.