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The Chicago Bulls’ upset of the Boston Celtics in Game 1 of their first-round series was the biggest surprise of the NBA playoffs—until the Bulls stunned the Celtics again to bring a 2-0 lead back home for Game 3 on Friday.
But this mediocre team’s sudden domination of the Eastern Conference’s top seed was most unusual because of how they did it. The Bulls are winning because they’re offensive rebounding. And NBA teams don’t do much…