Valdez, 34, has had an odd career arc, debuting with the D-backs in 2010 and then going seven years before returning to the Majors in 2017. He split that 2o17 season between the Athletics and Blue Jays organizations but struggled with both clubs. In all, he’s tossed 50 2/3 innings at the MLB level and yielded a 7.64 ERA.
Valdez hasn’t played affiliated ball since that 2017 campaign but has thrived in the Mexican League. His 2019 campaign, in particular, was a dominant effort in which he posted a 2.26 ERA with an immaculate 122-to-17 K/BB ratio in 147 2/3 innings. He’s continued that K/BB mastery in this year’s Dominican Winter League, running up a 1.11 ERA with 40 strikeouts against just four walks in 40 2/3 frames. Across parts of five Triple-A campaigns, Valdez has a 4.24 ERA with 7.3 K/9 against 2.4 BB/9.