Raonic withdraws

Top-seeded Milos Raonic has withdrawn from the Delray Beach Open tennis final in Florida because of a hamstring injury, handing the title to American Jack Sock. The 26-year-old Canadian, the fourth-ranked player in the world, slightly tore his right hamstring on Sunday in his semifinal victory over Juan Martin del Potro which forced him to pull out yesterday. The third-seeded Sock wound up with his second title of the year and moved up to a career-best 18th in the ATP rankings. The 24-year-old also won the Auckland Classic last month in New Zealand.