In 2017, Tatís played 117 games for the Fort Wayne TinCaps of the Class A Midwest League and 14 games for the San Antonio Missions of the Class AA Texas League, posting a combined .278 batting average with 22 home runs, 75 RBI, and 32 stolen bases as he was caught 15 times, and on defense, he made 30 errors and had a .936 fielding percentage.