An aggressive swinger with good lift to his game; lines the ball all over the field; average bat speed; needs to improve pitch recognition, can get too swing-happy; decent bunt game.
Good extension, lacks the frame and raw power to hit the ball over the fence, will hit for doubles and triples, HRs will come sparingly, <10 HR/season tops.
The kind of speed that forces infielders to rush; will steal many, many bags but currently not optimally used; needs to learn to control it for base-stealing. DIG 3.93.
Athletic, instinctive center fielder who tracks the ball well; good jumps and routes; speed allows him to cover ground, will stay in CF long term.
Strong arm; carry on a low line with accuracy; short, quick arm.
Sierra is a center fielder in the short- and long-term. He has the instincts, speed, and glove to create highlight reel plays. His body type should allow him to retain his speed over the long haul. Sierra has leadoff-guy ability with a hit tool that allows for fast-guy slug--triples and doubles. However, what's holding him back is his plate discipline and base-stealing, though more the former than the latter. Luckily, these are skills that talented ballplayers like Sierra improve with playing time, which he is sure to get. The formula is simple: improve his pitch recognition, he improves his hit tool.