SAN DIEGO -- D-backs third baseman Jake Lamb exited with a left quadriceps strain in the ninth inning of Arizona's 4-1 loss to the Padres on Wednesday at Petco Park.

Lamb is scheduled to undergo an MRI on Thursday, an off-day for the team, to determine the extent of the injury, but manager Torey Lovullo said at this point the team believes it’s a strained left quad.

“I felt something coming around first,” Lamb said. “Something in my quad, I don’t know. I’ll find out tomorrow I guess.”

Lamb, who was still having discomfort while walking around the clubhouse postgame, came up limping while running out an RBI double. He fell to the ground at second base in obvious pain.

“I’ve just never felt that,” Lamb said. “I might have been a little soft. I don’t think I needed to roll around as much, but I never felt that pain. It didn’t feel good. That’s for sure.”

Lamb made his first start of the year at third base after spending the entire spring and the first six games of the regular season transitioning to first.