Cubs shutting down RHP Guzman
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Guzman was recovering from left knee surgery when he began to experience soreness in his right shoulder at the start of spring training on Feb. 17.
Guzman threw 30 pitches off flat ground on Monday, and the pain didn't subside.
Guzman is expected to undergo an MRI exam Friday afternoon.
Bruce Levine covers baseball for ESPNChicago.com.