• World Baseball Classic tickets
Gregerson, 32, threw two scoreless innings for Team USA in the 2013 World Baseball Classic and is coming off a season in which he posted a 3.28 ERA in 59 appearances for Houston.
Carpenter hit .271/.380/.505 with 21 home runs and 68 RBIs in 129 games for St. Louis in 2016, earning his third All-Star nod
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.