Bud Norris threw 13 pitches against the Diamondbacks before exiting with an apparent injury. (Getty Images)

Dodgers pitcher Bud Norris faced two batters on Sunday before he was forced to leave his start against the Arizona Diamondbacks with an apparent injury.

Update (4:00 p.m.): Norris left the game with back muscle tightness, a Dodgers spokesperson announced.

Norris was seen reaching for his left side after walking the game’s first batter, Jean Segura. After a quick visit with a trainer and a few warm-up pitches, Norris stayed in to face Michael Bourn and got him to pop out.

That was Norris’ final pitch. After another short meeting with a trainer, Norris was removed from the game. Ross Stripling was summoned from the bullpen to face Paul Goldschmidt. Stripling last pitched Wednesday, throwing three innings out of the bullpen against the Tampa Bay Rays.

The Dodgers have 10 players on the disabled list. Twenty-two different players have spent time on the Dodgers’ DL this season, the most in the major leagues.