Mike Trout of the Los Angeles Angels became the youngest AL Rookie of the Year, a unanimous winner Monday after a season that put him in contention for the MVP award, too.
Washington Nationals outfielder Bryce Harper was awarded NL honors.
Trout hit .326 with 30 homers and 83 RBIs following his call-up from the minor leagues in late April.
Trout received all 28 first-place votes from the Baseball Writers' Association of America, becoming the eighth unanimous AL pick and the first since Tampa Bay's Evan Longoria in 2008.
Detroit second baseman Lou Whitaker had been the youngest AL winner in 1978, but he was 2 months, 26 days older than Trout when he took home the award.
Trout received the maximum 140 points. Oakland outfielder Yoenis Cespedes was second with 63, followed by Texas pitcher Yu Darvish (46), who joined Trout as the only players listed on every ballot.
In addition to Trout and Longoria, the only other unanimous AL winners were Nomar Garciaparra, Derek Jeter, Tim Salmon, Sandy Alomar Jr., Mark McGwire and Carlton Fisk.