There are approximately 40 regular-season games remaining for all 30 Major League Baseball teams, which makes now a good time to examine which rookies have made the greatest impacts so far this year. There are dozens of first-year players who have impressed to certain degrees, but we’ll narrow it down to five spots in each league.
It’s a laborious process to go through all the candidates in full detail, so we’ll take each league in turn, beginning with the top contenders from the American League:
1.) Michael Fulmer, RHP, Tigers:
With the Tigers mired in mediocrity last summer, outgoing general manager Dave Dombrowski made the wise decision to sell off established veterans on expiring contracts in hopes of landing long-term building blocks. One of those deals, to send outfielder Yoenis Cespedes to the Mets, is paying massive dividends this year. As the centerpiece of their return for Cespedes, the Tigers received right-hander Michael Fulmer, whom Baseball America, ESPN’s Keith Law and MLB.com each rated as a top 50 prospect entering last season.
Fulmer, 23, debuted with the Tigers on April 29 and has since produced like one of the game’s elite starters, let alone rookies. Through his first 120 big league innings (19 starts), Fulmer has recorded an AL-leading 2.25 ERA, which he backs with an excellent ground-ball rate (50.6 percent) and a K-BB percentage (15.0) that’s above the AL average of 12.9. In his latest outing, Fulmer went on the road to throw a complete game shutout against the formidable Rangers, striking out nine and walking none. Earlier this summer, Fulmer ran up the second-longest scoreless streak by a rookie over the past 45 years. At 33 1/3 frames, Fulmer fell just shy of Fernando Valenzuela’s 35-inning record that has stood since 1981.
Driving Fulmer’s success is his well-rounded repertoire, including a four-seam fastball that averages 95 mph and a pair of tremendous offspeed pitches. According to PitchFX, all have been among the highest-quality offerings of their kind this year. ERA estimators such as FIP (3.45), xFIP (3.69) and SIERA (3.84) call for a decline in run prevention for a pitcher with a .248 BABIP, but there’s little question that Fulmer has been the preeminent rookie in his league.
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