Full name Jonathan Stiwart Sierra
Born 10/17/1998 in Santo Domingo Centro, Dominican Republic
Profile Ht.: 6'3" / Wt.: 190 / Bats: L / Throws: L
Organization Prospect Rankings
Sierra did not rank among the top 30 prospects in the 2015 international signing class. However, the Cubs coveted the lean, athletic outfielder. Sierra signed for $2.5 million, the largest bonus the club handed out that year, $500,000 more than top prospect Aramis Ademan received. Sierra has a body and raw tools for scouts to dream on, with hitting ability that is much more raw than other recent high-dollar Cubs signees. He may already be taller than his listed 6-foot-3 and has the above-average speed and plus arm to fit the right-field profile defensively, and his glove is ahead of his bat at this point. He has shown above-average raw power and hasn't been able to tap into it yet as a pro, even though the Cubs installed him as the No. 3 hitter in the Rookie-level Arizona League team in his 2017 U.S. debut. Sierra has some buggy-whip to his swing, and Cubs officials believe in his pitch recognition skills. Sierra's learning curve to date has been slow, but he has athletic ability that stands out in the system. He likely will return to extended spring training to start 2018.