The king of retiring matches: Tipsarevic!

2011 US Open: RET vs Djokovic 6-7(2), 7-6(3), 0-6, 0-3
2011 Wimbledon: RET vs Karlovic 5-7, 1-3
2009 French Open: RET vs Murray 6-7(3), 3-6
2008 US Open: RET vs Sam Warburg 2-6, 0-1
2007 US Open: RET vs Nadal 2-6, 3-6, 2-3
2007 Australian Open: RET vs Nalbandian 7-6(5), 6-4, 6-7(2), 0-6, 1-2

2012 Paris: RET vs Janowicz 6-3, 1-6, 1-4
2012 Cincinnati: RET vs Andujar 4-6, 1-4
2010 Canada: RET vs Kohlschreiber 2-2
2010 Indian Wells: RET vs de Bakker 2-3

2008 Beijing Olympics: RET vs Oli Rochus 6-7(5), 3-2

from single_handed_champion of TW forum