From then through Thursday's complete-game six-hitter in the Pirates' 9-1 win over the Cardinals at Busch Stadium, Volquez is 5-1 with an ERA of 2.51. In winning four consecutive starts for the first time in his 10-year career, Volquez has allowed three earned runs in 30 innings (0.90 ERA).
"He's done a real good job. I'm very happy to see it," said Liriano, who will make his return on Sunday.
"Tell you the truth. I'm glad he's coming back. He's the true ace," said Volquez.