Vance Worley limited the Cubs to one unearned run over 5 2/3 innings en route to a win on Wednesday.
Vance Worley pitched well in Friday's victory over the Brewers, allowing just two runs on six hits over six strong innings.
Vance Worley surrendered six runs on seven hits in 6 1/3 innings against the Brewers on Saturday.
Vance Worley will begin the season in the bullpen.
Vance Worley blanked the Orioles for four innings in the Pirates' 4-2 victory on Sunday.
Vance Worley gave up two runs in two innings Wednesday against the Blue Jays.
Rob Biertempfel of the Pittsburgh Tribune-Review writes that Vance Worley "would seem to have the edge" over Jeff Locke for the fifth spot in the Pirates' rotation.
Vance Worley won his arbitration case against the Pirates and will make a $2.45 million salary in 2015.
Vance Worley requested $2.45 million and was offered $2 million from the Pirate when arbitration figures were exchanged.
Vance Worley is on the Pirates' roster for Wednesday's Wild Card Game against the Giants.
Vance Worley picked up a no-decision despite allowing one run over 6 1/3 innings as the Pirates defeated the Reds on Friday.
Vance Worley threw eight scoreless innings, allowing just four hits, in Sunday's 1-0 defeat of the Brewers.
Vance Worley will start on Sunday versus the Brewers.
Vance Worley has been moved to the bullpen.