MILWAUKEE — Giannis Antetokounmpo had 31 points and 14 rebounds and the Milwaukee Bucks pulled away late to beat the Boston Celtics 97-86 on Thursday night to force a Game 7 in the first-round series. Khris Middleton and Malcolm Brogdon each added 16 points, with Brogdon hitting a momentum-swinging 3 from the left corner to give the Bucks a two-possession lead with 5:22 left.