Juan Martin Del Potro
The winner of the 1990 U.S. Open is Pete Sampras, who beat Andre Agassi.
Lleyton Hewitt won the 2001 US Open Men's Singles title. He defeated Pete Sampras in the final. This was Lleyton Hewitt's first US Open Singles title.
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The matches have yet to be played for 2009. If you are asking about the 2008 singles champion, that would be Roger Federer and Serena Williams.
I believe it was ('Ace') Arthur Ashe in 1968, which year began the 'Open Era'.
There are many, many tennis tournaments every year. There are four major tournaments - 3 of which (the Australian Open, French Open and Wimbledon) have a women's singles champion. The US Open is not held until August/September. Australian Open Women's Champion - Victoria Azarenka French Open Women's Champion - Maria Sharapova Wimbledon Women's Champion - Serena Williams