Los Angeles Dodgers ace Walker Buehler left the 7-2 loss to the San Francisco Giants at Oracle Park after four innings with right elbow discomfort.
The 27-year-old, who left the game after throwing just 70 pitches in Friday night's game, is 14/1 to win the National League Cy Young award in 2022.
Neither he nor his manager Dave Roberts wanted to speculate on the severity of the problem, but there is always a concern when it is an elbow injury.
Buehler has had Tommy John surgery previously and has dealt with occasional discomfort in his right elbow over the years.
After the Giants loss, he revealed he first noticed something was bothering him after throwing a breaking ball in the third inning. He completed the fourth inning, but after showing noticeable discomfort, the Dodgers and Buehler decided to end his start before anything worse happened.
The Dodgers will give Buehler an MRI on Saturday and await the results to determing much time he will miss.
Los Angeles have dealt with multiple injuries to their starters this season as Andrew Heaney is currently on the injured list with a left shoulder problem and Clayton Kershaw is set to return after missing a month with a back issue.
Speaking to MLB.com, Buehler said: "I've had Tommy John surgery, so I think the level of concern is a little heightened. It is what it is.
"This happens in the game.
"A lot of guys in this clubhouse have delta with stuff with their elbows. It's part of this game. I have faith in our medical staff and whatnot. But before we drive into that, we need to know what we're dealing with."
The Dodgers have managed to weather their injury problems so far and still sit top of the National League West with a 37-21 record.