Pomeranz has allowed just three earned runs -- two via solo homers -- in 13 2/3 innings this year, striking out 11 and walking six. He last started July 22, 2013, with the Rockies and has a 5.40 ERA in 30 career starts.
Right-hander Arnold Leon, called up Wednesday from Triple-A to serve as the club's 26th man on the active roster, was available in relief for both games.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.