Pirates LHP Liriano scratched with neck tightness
Vance Worley (3-4) was tabbed as his replacement, which set off two lineup changes for the Brewers, who wanted to take advantage of the right-hander.
Worley last started on May 14 against the Phillies after being part of the Pirates' rotation the first month of the season.
There was no immediate word on the severity of Liriano's injury. Liriano (5-6) had made all 18 of his previously scheduled starts this year.