I'm starting to think he's our best bet outside of Cabrera to help in the major league pen in 2014, of all our minor leaguers. Arrieta, Cabrera, Rosscup, Rivero, Vizcaino. There's a ton of potential there for a good bullpen to spontaneously emerge. If that happens, this team contends. In Rivero's last six appearances, he has 10.2 IP, 0 R, 5 H, 4 BB, 20 K.