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Fact: The Celtics are the worst rebounding team in the NBA.
Also fact: The Sixers are the seventh best rebounding team in the league.
See the advantage?
As stated earlier, the Sixers brutally defeated the Celtics in their first matchups this year. Still, it's important to go even further and look at these games.
In both games combined, Philadelphia out-rebounded Boston by 30. Even when the Sixers lost in their third encounter, they still outplayed them on the boards.
It's clear the Celtics do not fare well on the boards and the Sixers have consistently outplayed the Celtics on the rebounding side of the game.