The 26-year-old Rondon made his big league debut in 2014, firing one scoreless inning in his lone appearance. The rest of the season was spent at the Triple-A level for Rondon, where he pitched to a 3.03 ERA with 7.4 K/9 and 2.9 BB/9 in 62 1/3 innings of relief work.
Prior to the 2013 season, Baseball America ranked Rondon as the Cards’ No. 24 prospect and graded his slider as the best in the Cardinals’ minor league system. Per BA’s scouting report from that timeframe, Rondon’s fastball has touched 100 mph, but he struggles with his command at times, particularly when he reaches back to get extra life on the previously mentioned heater. He figures to compete for a bullpen job with Colorado next spring.
Scahill, 27, totaled a 4.80 ERA in 15 innings with the Rockies this season and has pitched to a 4.42 ERA in 57 frames with the Rockies over the past three years. He’s averaged 5.5 K/9 and 3.3 BB/9 in the Majors while featuring solid life on his fastball — an average of 94.4 mph.