Middleweight champion Marvelous Marvin Hagler has a strained back -- not a ruptured disk, as feared -- and will be able to begin training again in two to three weeks, his doctor in Wareham, Mass., said.

Hagler, who suffered a back injury last week, was examined for 90 minutes after a California physician told him he possibly had ruptured a disk, which would have been a career-threatening injury.

Hagler also broke his nose this week in a sparring accident in Palm Springs, Calif., prompting his handlers to postpone a scheduled Nov. 14 bout in Las Vegas with John Mugabi, which is expected to be rescheduled for late February. TENNIS

Boris Becker and John McEnroe easily advanced to a semifinal matchup in the world's richest indoor event, the $850,000 European Champions' Championship in Antwerp, Belgium. Becker defeated Tim Wilkison, 6-2, 6-1, and McEnroe beat Mark Dickson, 6-0, 6-2. Anders Jarryd upset Mats Wilander, 1-6, 6-2, 6-4, for his third victory over Wilander in nine matches. Jarryd next will face Ivan Lendl, who advanced after Henri Leconte suffered a sprained ankle in the third game of their match. Leconte trailed, 4-2, when he retired.