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| 2001 Hamlet Cup | |
|---|---|
| Date | August 20–26 |
| Edition | 21st |
| Category | International Series |
| Surface | Hard / outdoor |
| Location | Commack, New York, U.S. |
| Venue | Hamlet Golf and Country Club |
| Champions | |
| Singles | |
 Tommy Haas | |
| Doubles | |
 Jonathan Stark /  Kevin Ullyett | |
The 2001 Hamlet Cup was a men's tennis tournament played on outdoor hard courts at the Hamlet Golf and Country Club in Commack, New York in the United States and was part of the International Series of the 2001 ATP Tour. It was the 21st edition of the tournament and ran from August 20 through August 26, 2001. Sixth-seeded Tommy Haas won the singles title.
