Roger Federer’s comeback from knee surgery will have to wait until the Monte Carlo Masters in two weeks. Federer, the former world No. 1, withdrew Friday from the Miami Open in Key Biscayne, Fla., because of a stomach virus.
Federer, who is ranked No. 3 and was seeded third, pulled out hours before he was to face the former world No. 4 Juan Martín del Potro in the second round.
It was to be Federer’s first action since losing to top-ranked Novak Djokovic in the semifinals of the Australian Open, after which he twisted his left knee and tore his meniscus at home in Switzerland.