Right-hander Andrew Cashner's first major league start was going very well until he exited Tuesday's 6-5 victory over the Diamondbacks with tightness in his right shoulder.
Cashner had just walked Willie Bloomquist with one out in the sixth inning when the Cubs' trainer came out along with manager Mike Quade and pitching coach Mark Riggins.
Quade said Cashner was on his way to see the team doctor after the game and that an MRI was possible.
"I don't think we'll really know anything until (Wednesday)," Quade said. "He just felt a little tightness. We're going to be cautious with everybody, especially early in the season. Hopefully, it's not something serious. He didn't have any trouble in (spring training) camp. This caught us off-guard completely.
"Again, he was honest with us. Hopefully, we were able to get him out of there before anything bad happened."
Cashner, 24, won the No. 5 spot in the rotation in spring training, beating out veteran Carlos Silva, whom the Cubs released shortly after that because of critical comments Silva made about Riggins.
Cashner worked in 53 games in relief last year. He throws hard, but command and developing a full repertoire of pitches had been concerns. Cashner had a good fastball Tuesday, hitting 97 mph. He also threw several good sliders. Over his 5 1/3 innings, he threw 72 pitches, 43 strikes.
"I didn't even realize anything was going on with him," said backup catcher Koyie Hill, who worked Tuesday's game.
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