The Mariners' top prospect has started running on flat ground for the first time since suffering a season-ending knee injury last July

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PEORIA, Ariz. — Kyle Lewis is making strides in his recovery from season-ending knee surgery, literally. The Mariners’ top prospect and first-round pick from 2016 suffered a torn anterior cruciate ligament, torn medial and lateral meniscus in his right knee when it bent awkwardly while colliding with the catcher in a game on July 19. 

He underwent reconstructive surgery on Aug. 11 and moved to Arizona to work with the Mariners’ staff at the complex in Peoria for his recovery. 

On Thursday, Lewis posted this video of him running on flat ground — something he hadn’t been able to do. All previous running was on an anti-gravity treadmill. This is a major step in the recover. Lewis is expected to be ready to return to game action by July.

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