Among the options listed, the 2009 Australian Open semifinal between Rafael Nadal and Fernando Verdasco at 5 hours and 14 minutes is the longest match. Nadal vs Federer at 2008 Wimbledon was approximately 4 hours and 48 minutes, not 5h45m as stated. However, the actual longest Grand Slam match in tennis history was Isner vs Mahut at Wimbledon 2010 (over 11 hours).