Jordan Crawford says the young Boston Celtics have a few things to learn about finishing out close games. Crawford took over the role of teacher Tuesday night, scoring 15 of his 25 points in the fourth quarter to help the Celtics hold off the Milwaukee Bucks 108-100. ‘‘We've just got to learn to stay focused and pull out these wins — grind them out,’’ said Crawford, who was 5 for 5 from the field in the fourth, including three 3-pointers. Jeff Green added 18 points and Brandon Bass added 16 points and nine rebounds for the Celtics, who were coming off a 92-85 loss to the Bucks on Saturday in Milwaukee. Of Milwaukee’s three wins this season, two have come against Boston and the Celtics avoided having the total reach three by holding off the Bucks down the stretch. ‘‘We moved the ball side to side and inside-out way better than we did Saturday,’’ coach Brad Stevens said. ‘‘Maybe that’s a little bit of karma for why the shots went in.’’ Avery Bradley scored 15 and Jared Sullinger finished with 12 points as all five starters scored in double figures for Boston, which had lost two of three. The Bucks had just snapped an 11-game losing streak by beating the Celtics on Saturday in Milwaukee, but couldn’t quite rally from a 13-point deficit in the fourth quarter. ‘‘I think we’re getting a little better. They still made a run and made it close,’’ Crawford said. O.J. Mayo scored 19, and Brandon Knight had 15 points and six assists for Milwaukee. Khris Middleton added 14 points for the Bucks, who were outrebounded by the Celtics 40-33. The win put the Celtics at least in a temporary tie for first place with Toronto, which played later Tuesday at Golden State. But in the Atlantic Division, which currently doesn’t have a team with a winning record, the standings aren’t all that impressive. ‘‘We’re 8-12. It’s not like we’re lighting the world on fire,’’ Stevens said. The Celtics led by as many as 15 points and had a 13-point lead in the final period cut to three twice before holding on for the win. ‘‘I felt we were right there. They just made the tough shots,’’ Milwaukee coach Larry Drew said. ‘‘They made the plays down the stretch and we did not.’’