Marrero, the 24th overall pick, reportedly agreed on a $2.05 million signing bonus. He hit .286 at Arizona State this past season, but scouts see him as a line-drive hitter with potential to develop more power as he matures.
Even if Marrero becomes a slugger down the road, his best contributions might come at shortstop: His Cape league coach, Mike Roberts, considers Marrero one of the best defensive prospects he's ever seen.
"He's the best amateur baseball player on the defensive side I've ever seen in 35 years of coaching," Roberts said. "He's Omar Vizquel at 20, 21, except he'll be a better hitter and steal more bases. I've seen him do things defensively I've never seen another infielder do."