DENVER -- After facing just three hitters in the sixth inning, Marlins reliever Bryan Morris left Saturday's 10-5 loss to the Rockies with a lower back strain. He is listed as day-to-day.
With a runner on and one out, Morris battled back from a 3-1 count to strike out Wilin Rosario, but Marlins manager Dan Jennings and a trainer jogged out to check on Morris immediately after. The conversation lasted just a few minutes, and Morris eventually walked off the field with the trainer by his side. He threw just 13 pitches.
"I think his back tightened up on him," Jennings said. "[Head trainer] Sean [Cunningham] is going to look at him and make a determination, but right now for sure, he's day-to-day. You certainly don't want to see that with the way the bullpen has been throwing it of late."
Right-hander Kendry Flores, who made his Major League debut, took over for Morris and stranded the runner. Flores yielded a single before retiring Daniel Descalso on a popup to end the frame.
"Major League debut in that situation, it was a tough spot to be in," said Jennings, who didn't have Flores warming up before Morris exited. "I'm very proud to see a guy get his debut in a ballpark like this and execute pitches."
Dargan Southard is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.