Career
He has played in Major League Baseball (MLB) for the Detroit Tigers. The Detroit Tigers purchased Mercedes" contract after the 2012 season, adding him to their 40-man roster. The Tigers promoted Mercedes to the major leagues on August 14, 2014.
Before being called up, Mercedes had a 4.33 European Research Area and a 1.33 WHIP in 41 appearances for the Triple-A Toledo Mud Hens.
Mercedes made his major league debut on August 15, when he pitched two scoreless innings, allowing no hits or walks, and recording two strikeouts. On August 17, Mercedes was optioned back to the Toledo Mud Hens.
On December 11, 2014, Mercedes was designated for assignment by the Tigers. On December 19, 2014, Mercedes was outrighted to Triple-A Toledo.
During the 2015 season, he split time between the Double-A Erie SeaWolves and Triple-A Toledo Mud Hens.
On December 23, 2015, the Tigers re-signed Mercedes to a minor league contract. On March 23, 2016, the Tigers releases Mercedes.