Longest Tennis Marathon, Singles
 
WHO:

George L. Bolter and Athos Rostan III

WHAT:
31 hr 35 min 30 sec
WHERE:
Hickory, United States
WHEN:
8-9 November 2008

The longest marathon playing tennis (singles) was 31 hr 35 min 30 sec and was achieved by George L. Bolter and Athos Rostan III (both USA), in Hickory, NC, USA, on 8-9 November 2008.