Colorado Rockies injury news: Tyler Anderson and Seunghwan Oh

A pair of Colorado Rockies and their injuries were in the news on Monday afternoon before the Rockies met the Chicago Cubs to begin a three-game series at Coors Field.

First, Tyler Anderson‘s bad year seemingly keeps getting worse. Nick Groke of The Athletic is reporting that the Colorado Rockies left-hander will undergo knee surgery in Chicago on Tuesday to repair cartilage. It is described as a “significant operation,” meaning Anderson won’t be returning to the Colorado rotation any time soon.

Could that mean the 29-year-old Anderson is done for the year? It’s possible, depending on the extent of the surgery. He has made just five starts so far this season, throwing 20.2 combined innings and posting an 11.76 ERA. He has allowed 33 hits, helping his WHIP skyrocket to 2.13.

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The Colorado rotation has changed significantly since Opening Week. Opening Day starter Kyle Freeland is currently in Triple-A and Chad Bettis has transitioned to the bullpen. Antonio Senzatela, Jeff Hoffman and Peter Lambert join Jon Gray and German Marquez in the current version of the Colorado starting five.

Second, Colorado reliever Seunghwan Oh was placed on the 10-day injured list with a left abdominal strain. It is the first-ever stint in his Major League career that began in 2016 with the St. Louis Cardinals. Oh has compiled a 3-1 mark with a 9.33 ERA so far this season in 21 appearances totaling 18.1 innings. He has six walks and 16 strikeouts in this outings but has struggled mightily, as evidenced by his career ERA being more than six runs lower than his current ERA.

To take Oh’s place on the active roster, Colorado called up 24-year-old left-hander Phillip Diehl to make his first appearance  on a Major League roster. He was acquired by Colorado from the New York Yankees in exchange for outfielder Mike Tauchman on March 23 and has progressed from Double-A to claim his first big league roster spot.

Diehl and Jake McGee are currently the only two left-handers in the Colorado bullpen.