CHICAGO >> Isaiah Thomas scored 33 points, and the Boston Celtics beat the Chicago Bulls 104-95 on Sunday to tie their first-round playoff series at 2-all. Boston blew a 20-point lead, but Thomas keyed a third-quarter run that put the Celtics back on top after Chicago briefly went ahead. Gerald Green made four 3-pointers on his way to 18 points, helping the top-seeded Celtics return the favor in Chicago after dropping the first two games at home.