Thomas will be on Arizona's taxi squad, Nick Piecoro of The Arizona Republic reports. One of the Diamondbacks' top prospects, Thomas dominated at Low-A (153 wRC+) but struggled in 23 games at High-A (89 wRC+) in 2019. He is unlikely to get significant playing time in the majors this year.
Thomas said he expanded his strike zone after being promoted to High-A Visalia, Pat Disabato of the Daily Southtown reports. Thomas had a .312/.393/.479 slash line at Low-A Kane County before an August promotion to Visalia, where he hit .255/.327/.340 and raised his strikeout rate to 31.7 percent over 23 games. He rebounded in the playoffs, helping the Rawhide win the California League championship with a walk-off base hit in the deciding game. Thomas had hit well at every minor-league stop since being drafted in the second round of the 2018 draft, but the center fielder ran into his first taste of adversity at Visalia. "I expanded my zone and got a little too aggressive," he said. "In the playoffs, I stopped being so aggressive, and I'd end up getting a pitch I liked. The results were better." The soon-to-be 20-year-old Thomas is considered an advanced hitter for his age and covers a lot of ground in center field. He'll continue to work on managing the strike zone once the 2020 season kicks off.
Thomas was promoted to High-A Visalia on Saturday. Thomas hit .312/.393/.479 with eight home runs, 11 steals and a 17.9 percent strikeout rate in 91 games for Low-A Kane County en route to establishing himself as a top-50 prospect for dynasty leagues.
Thomas had a two-game stretch this week in which he went 9-for-10, including hitting for the cycle for Low-A Kane County. The 19-year-old outfielder had five hits Tuesday, falling a home run short of the cycle, then accomplished the feat Wednesday when he had four hits. Thomas, Arizona's second pick (63rd overall) in the 2018 draft, is mashing for the Cougars, leading them in average (.308), slugging (.498) and OPS (.888). Wednesday's homer was the eighth for Thomas, the Diamondbacks' No. 2 fantasy prospect, and he represented the Cougars in the Home Run Derby as part of the Midwest League All-Star Game festivities in June.