World number four Rafael Nadal on Tuesday said he had withdrawn from the Masters 1000 hardcourt event underway in Toronto due to persistent pain in his injured left foot. The injury kept the 20-time Grand Slam champion out of Wimbledon and the Tokyo Olympics this year and played a role in his shock third-round exit at the Washington Open last week. “I have had this issue for a couple of months, as people know,” said Nadal, a five-time winner of the event which was cancelled last year due to the COVID-19 pandemic. “Of course, it is not a happy situation after all the success that I had here in Canada, not being able to play this year after missing a year.” He said the decision was a tough one but added that the most important thing was getting better so he could go back to appreciating his time on the …