For his first tattoo, Javier Baez went with the Major League Baseball logo on the back of his neck.

That gives you an idea of the confidence and swagger Baez had as a teenager, even before the Cubs made him the ninth overall pick in the 2011 draft.

Baez, who turned 20 last month, is definitely on the fast track now, the youngest of the 12 players the Cubs invited to Chicago for their rookie development program. Baseball America rated him as the organization's No. 1 prospect now and the Midwest League's top prospect last season.

The scouting report from manager Dale Sveum is that Baez has Gary Sheffield bat speed. A gifted shortstop, Baez was also strong enough and tough enough as a high school kid to play catcher sometimes. One talent evaluator believes Baez can be moved wherever the Cubs need him once he's ready.

"It really doesn't matter where I play," Baez said Thursday after a workout at Northwestern University's athletic complex in Evanston. "I'm going to do my job."

The Cubs already have an All-Star shortstop in Starlin Castro, who will turn 23 in March and remains under club control through 2020. But vice president of scouting and player development Jason McLeod isn't prepared to move Baez yet.