Thornton was originally selected by Oakland in the 23rd round of the 2010 First-Year Player Draft out of the University of Oregon. In 2011, he was named to the Midwest League mid-season All-Star team after posting a 5-4 record, 2.39 ERA and 82 strikeouts in 40 relief appearances for the Burlington Bees.
Since making his professional debut in 2010, Thornton has gone 11-6 with 21 saves, a 3.29 ERA (169.2ip/62er) and 187 strikeouts in 107 career minor league relief appearances.
The 19-year-old Medina posted a combined 1-3 record, 4.14 ERA (50.0ip/23er) and 50 strikeouts in 11 games (seven starts) between the GCL Orioles and Aberdeen IronBirds in 2012.
Medina was originally signed by Baltimore as a non-drafted free agent on December 14, 2009. Since making his professional debut with the Dominican Summer League Orioles in 2010, Medina has posted a 9-10 record, 3.15 ERA (166.0ip/58er) and 159 strikeouts in 35 games (30 starts) in the minor leagues.