Ben Simmons enjoyed a tremendous rookie season. And yet, after reaching heights previously unimaginable for NBA debutants, the Australian was brought down to earth in the Philadelphia 76ers' playoffs defeat to the Boston Celtics. The Sixers were simply a better team against Boston when their Rookie of the Year was on the bench. With Simmons on the court, the Celtics outscored Philadelphia by 63 points. That was the worst plus/minus of any player in that series.