Boston Celtics Kyrie Irving made NBA history in Mavs vs. Celtics Game 8 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…