Track Record: A second-round pick by the D-backs in 2013, Williams was traded to the Rays in the Jeremy Hellickson deal in 2014. He made his major league debut with Tampa Bay last year before the Rays traded him and two others to the Cardinals for Tommy Pham at the trade deadline.

Scouting Report: Williams' lefthanded power and athleticism intrigue, but he's still very raw. He takes defensive, segmented swings, and the Cardinals see him as a swing-change candidate. He flashes plus raw power, and the hope is a swing change can unlock that in games. Williams' jumps and instincts come and go in right field, but he works hard and has the plus arm for the position. He's a fringe-average runner so he's mostly limited to the corners, although he can cover center in a pinch.

The Future: The Cardinals feel they got a fourth outfielder at worst with Williams' lefthanded power and ability to move around the outfield. If he can successfully implement a swing change, he may be more.