Juan Nicasio failed to make it out of the fifth inning Saturday, allowing four runs on seven hits over 4 2/3 innings in a loss to the Rangers.
Pirates optioned LHP Kyle Lobstein to Triple-A Indianapolis.
Pirates re-instated LHP Tony Watson from the paternity leave list.
Jung Ho Kang homered and drove home three runs on Friday as the Pirates routed the Rangers 9-1 in Texas.
Jon Niese picked up his fifth victory of the season on Friday, firing six innings of one-run ball against the Rangers in Arlington.
John Jaso is absent from the Pirates' lineup Friday.
Jung Ho Kang went 3-for-5 with a double and two RBI as the Pirates topped the Diamondbacks 8-3 on Thursday.
Despite allowing just an unearned run over five innings and hitting a three-run homer, Gerrit Cole didn't factor into the decision in Thursday's game against the Diamondbacks.
Francisco Cervelli is back in the Pirates' starting lineup Thursday versus the Diamondbacks.
Mark Melancon worked around a two-out double to throw a scoreless inning and record his 16th save in Wednesday's 5-4 win over the Diamondbacks.
David Freese went 1-for-3 with a go-ahead, two-run homer in the fifth inning in Wednesday's 5-4 comeback win over the Diamondbacks.
Gregory Polanco went 3-for-4 with a double, an RBI and a run scored in Wednesday's win over the Diamondbacks.
Jeff Locke served up a pair of home runs in Wednesday’s outing against the Diamondbacks, ultimately getting tagged for four runs in 6 1/3 innings but earning his third win.
Pirates athletic trainer Todd Tomczyk said that the range of motion and strength in Elias Diaz's injured right elbow are getting "close to normal."
Francisco Cervelli is out again Wednesday.