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It's always been the area that has kept Lopez from being considered elite.
He's averaged just 7.5 rebounds in 33.8 minutes for his career, and he's averaged fewer than seven in each season since 2009-10.
This game was no different.
In his 23-plus minutes, he pulled down just four rebounds.
He did keep a couple balls alive by tipping them to the perimeter, but not enough to consider him a real factor on the glass.
Two things really hindered his ability to grab rebounds.
For starters, Detroit wings were finding some success attacking the basket. As the team's best shot-blocker, Lopez rotated to challenge those looks, but he gave up valuable rebounding position in the process.
What keeps his grade so low, though, were the poor decisions that he made.
He often rotated too early, leaving his man at the basket trying to challenge plays that he couldn't even get to. He also gave up his position too early, assuming some plays were over that weren't.