Francisco Liriano left his start tonight in the fourth inning due to discomfort in his left side.
Liriano threw a pitch to Anthony Rizzo that appeared to cause him discomfort. The infielders converged on the mound, and manager Clint Hurdle and head athletic trainer Todd Tomczyk visited Liriano on the mound.
Liriano kept stretching, touching his toes and twisting to the side. He threw three warmup pitches before leaving.
Liriano completed three-plus innings and allowed two runs, both on Rizzo's home run in the first inning, on three hits. He struck out four without walking a batter and had retired six in a row before leaving.
Jeanmar Gomez replaced Liriano.
The Pirates' rotation is already in trouble after Gerrit Cole went on the 15-day disabled list because of shoulder fatigue.