Spaniard Rafael Nadal retired during a match for the first time in more than six years when he quit during his second round encounter against Damir Dzumhur of Bosnia at the Miami Open yesterday. Sporadic boos greeted 14-times grand slam champion Nadal when he called it a day after seemingly feeling ill during the third set of his encounter in oppressive humidity in south Florida. The 94th-ranked Dzumhur, led 2-6, 6-4, 3-0 at the time, and was up 30-15 on serve. The last time Nadal quit during a match was in a quarter-final against Andy Murray at the 2010 Australian Open. There was no immediate comment on the exact nature of Nadal's problem, but it seemed not to be injury-related.