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One month ago, LHP Wade Miley looked to be the clear frontrunner for the 2012 National League Rookie of the Year Award. But a slump for Miley in September, combined with a great month for Bryce Harper, have made the race much closer. Let's start with a look at the overall stats for each player.

W L IP ERA FIP WHIP K/9 BB/9 HR/9 bWAR fWAR
Wade Miley 16 11 187 3.32 3.21 1.20 6.4 1.8 0.6 3.3 4.5
PA R HR RBI SB/CS AVG OBP SLG wRC+ bWAR fWAR
Bryce Harper 578 94 21 58 17/6 .264 .334 .465 116 4.3 4.5

Harper has now caught Miley in FanGraphs's WAR calculation, and has passed him in Baseball-Reference's version. The difference in the month of September has been pretty dramatic. Miley has allowed 19 ER in 29 IP in September, for a 5.90 ERA and a 1.724 WHIP. Meanwhile, Harper has hit .305/.377/.611 with 4 SB during this month. And Harper has two more things going for him. His team has the best record in the National League, and Harper has been a big part of that, while Miley's Diamondbacks have been stuck around the .500 mark. And secondly, Harper has had a historic season for a 19 year old, posting the best-ever WAR by a teenager - http://bbref.com/pi/shareit/eh33M

Player Age Year bWAR
Bryce Harper 19 2012 4.3
Mel Ott 18 1928 3.7
Edgar Renteria 19 1996 3.1
Ken Griffey, Jr. 19 1989 2.9
Ty Cobb 19 1906 2.3

Miley has had an outstanding season, and has been the Diamondbacks' best pitcher for the year, but his late slump combined with Harper's hot streak means that Miley will probably end up second in the 2012 NL Rookie of the Year balloting.