Infobox last updated on: April 27, 2009.
Mark Knowles (born September 4, 1971 in Nassau, Bahamas) is a professional male tennis player from the Bahamas. He was awarded All American honors at UCLA in both singles and doubles. His highest singles ranking on the ATP was World No. 93. He has been very successful in doubles partnering with Canadian Daniel Nestor. The pair have won the 2002 Australian Open, the 2004 U.S. Open, and the 2007 French Open. Mark is known for his "quick hands and unbelievable volleys".
On July 5, 2006, Knowles participated in the longest match in Wimbledon history, lasting 6 hours and 9 minutes.