The Reds Todd Frazier has had a great season and with many thinking he would slide off with more AB's and footage of him, he hasn't.
With 300+ AB's of a near .900 OPS and slugging percentage aroung .550, is he the NL Rookie of The Year? Harper has slid off, and there are some other interesting rookies, but Frazier's 2.6 WAR is a leader among them. Miley, then Rizzo (just not enough ABs) would be the competition that I see.