Aug 11 (Reuters) - Rafa Nadal"s U.S. Open preparations have suffered another setback after the Spaniard withdrew from next week"s Cincinnati hardcourt event with a nagging foot issue, organisers of the Masters 1000 tournament said on Wednesday. Nadal suffered a shock exit last week in Washington, where he kicked off his lead-up to the U.S. Open, and on Tuesday pulled out of the ongoing Masters 1000 event in Toronto with a left-foot issue. The Spaniard is the latest in a number of high-profile names to sit out next week"s Western & Southern Open, joining a list that includes Novak Djokovic, Roger Federer, Serena Williams and Sofia Kenin. In his pre-tournament news conference in Toronto on Sunday, Nadal said a recurring foot issue he has been dealing with since 2005 returned at the French Open, where he fell to eventual champion Djokovic in the semi-finals. read more When discussing his Toronto withdrawal Nadal, who also sat out Wimbledon and the Tokyo Olympics, said: "With this pain, I am not able to enjoy, and I really don"t believe that I have chances to fight for the things that I really need to fight." The U.S. Open runs from Aug. 30-Sept. 12. Canadian Milos Raonic, who was runner-up at the 2020 Western & Southern Open, which was held in New York in a bid to limit travel ahead of the U.S. Open due to the COVID-19 outbreak, has also withdrawn from the Cincinnati event with a heel injury.