Yu Darvish left his spring training debut with tightness in his right triceps on Thursday after pitching a scoreless first inning.

The Texas Rangers took on the Kansas City Royals in Arizona.

Darvish threw just 12 pitches before leaving for precautionary reasons.

"I don't really think it's anything to worry about," Darvish said through a translator. "I commanded my pitches. I didn't throw hard. I worked on my location."

Darvish was 10-7 with a 3.06 ERA last year before missing most of the final two months with elbow inflammation.