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MIAMI (CBSMiami/AP) — Suffering a right knee injury, Miami Heat center Hassan Whiteside left Saturday’s Game 3 of the Eastern Conference semifinals against the Toronto Raptors in the second quarter.

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The team quickly said the NBA’s leading shot-blocker this season wouldn’t return, though there was no immediate word on the severity of the injury.

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Whiteside started falling back awkwardly as he tried to get position for a rebound, then it appeared his knee collided with Toronto’s Cory Joseph and Heat teammate Luol Deng as he went down. He was tended to near the bench by Heat athletic trainer Jay Sabol, then limped into the locker room for further evaluation.

Whiteside had six points on 2 for 2 shooting in eight minutes Saturday. He came in averaging 12.7 points and 12.1 rebounds in the playoffs.

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