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He finished the season with 33 saves and a 2.74 earned run average.
He finished the season with 33 saves and a 2.74 earned run average.
Valdez played for the Dominican Summer League Tigers from 2009 to 2011. He played for the Gulf Coast Tigers in 2012. He played the 2013 season with the West Michigan Whitecaps and the Lakeland Flying Tigers and was the closer for both teams.
He was added to the Tigers 40-man roster on November 20, 2013.
Valdez was recalled by the Tigers on July 31, 2015, and made his major league debut later that night in a game against the Baltimore Orioles. In his debut, Valdez faced four batters, allowing three hits, two earned runs, and one walk, without recording an out in the inning, and taking the loss.
Prior to being recalled, Valdez was 2–0 with one save, and a 2.03 European Research Area over his last 10 games with the Toledo Mud Hens. He was optioned back to Toledo on August 4 after his lone start to make room on the roster for Matt Boyd, who started the next day.
Valdez had a 4–4 record and a 3.44 European Research Area in 38 appearances with Toledo, having allowed 44 hits over 521⁄3 innings, with 33 walks and 40 strikeouts.
Valdez was called up to the Tigers again on August 20, 2015, when starters Daniel Norris and Anibal Sánchez were placed on the disabled list. He made a total of seven appearances (9 innings) with the big-league club in 2015.