Who defeated lennox Lewis in April 2001?

Oliver McCall was the first in 1994, and Hassem Rachman was the second in 2001.

Lewis became the only heavyweight to avenge all of his losses, an Ali would have done it much sooner has he not made a comeback after the Leon Spinks rematch.

http://www.boxrec.com/list_bouts.php?human_id=451&cat=boxer