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BOSTON - APRIL 24: If the Celtics are to have any chance of adding another championship banner to the rafters at the Garden this season, guard Avery Bradley may have to come up big, considering the uncertain status of Ray Allen, not pictured, who is battling bone spurs. The Boston Celtics hosted the Miami Heat in an NBA regular season game at the TD Garden. (Photo by Jim Davis/The Boston Globe via Getty Images)

The Boston Celtics have won seventeen NBA Championships.