Boston Celtics Kyrie Irving made NBA history in Mavs vs. Celtics Game 10 months ago The Boston Celtics and Dallas Mavericks are playing in Massachusetts on Friday night. Kyrie Irving created NBA history during the… Al Horford signs a $20 million, two-year contract with the Celtics 2 years ago Al Horford's agent says on Thursday morning that the Boston Celtics center has agreed to a two-year, $20 million contract…