The 23-year-old Mujica is coming off a season lost to Tommy John surgery. In his most recent action, he fired 36 2/3 innings of 2.70 ERA/2.81 FIP ball with 8.35 K/9 and 2.45 BB/9 at the Triple-A level for the Rays in 2018. Mujica had never pitched in Triple-A ball before then, making his strong output all the more impressive.
Parsons is just a few months removed from joining the Rockies, who claimed him off waivers from the Braves toward the end of August. The 27-year-old wound up throwing 19 1/3 innings for the Rox this past season, but he stumbled to a 6.98 ERA with more walks (16) than strikeouts (14). Parsons showed similar control problems with the Braves earlier in the year, as he issued 13 walks and struck out 12 in 15 1/3 innings, though he did manage a 3.52 ERA. But Parsons has been far stingier with walks at the Triple-A level, where he has logged 8.2 K/9, 3.1 BB/9 and a 3.41 ERA over 153 frames.