I've just checked, and Janko Tipsarevic has retired in 7 majors. Those were against David Nalbandian at the 2007 Australian Open, against Rafael Nadal at the 2007 US Open, against Sam Warburg at the 2008 US Open, against Andy Murray at the 2009 French Open, against Ivo Karlovic at 2011 Wimbledon, against Novak Djokovic at the 2011 US Open, and against Nicolas Almagro at the 2013 Australian Open.
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