Hyun-Jin Ryu begins his submaximal throwing program.

CHICAGO >> If a pitcher you’re hoping can start in October is only allowed to play light catch for less than 10 minutes on September 20, you’ve got a problem.

For Hyun-Jin Ryu, it’s a start.

The left-hander apparently felt well enough to begin his submaximal throwing program at Wrigley Field on Saturday morning. What is “submaximal”? In Ryu’s case, he tossed the ball to a bullpen catcher for 5-10 minutes while head athletic trainer Stan Conte watched.

Dodgers manager Don Mattingly said the plan is for Ryu to “ramp up” his throwing intensity in the coming days.

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About J.P. Hoornstra

J.P. Hoornstra covers the Dodgers, Angels and Major League Baseball for the Orange County Register, Los Angeles Daily News, Long Beach Press-Telegram, Torrance Daily Breeze, San Gabriel Valley Tribune, Pasadena Star-News, San Bernardino Sun, Inland Valley Daily Bulletin, Whittier Daily News and Redlands Daily Facts. Before taking the beat in 2012, J.P. covered the NHL for four years. UCLA gave him a degree once upon a time; when he graduated on schedule, he missed getting Arnold Schwarzenegger's autograph on his diploma by five months.