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While some people think Mayberry is "the future oh the Phillies," that title still belongs to Domonic Brown. 27-year-old rookies should not really ever be considered the future of any team. For every Jose Bautista, there are tons of other late bloomers who will have a couple good seasons before falling off. I'm not saying Mayberry cannot be like a lite-Bautista, I'm saying the odds significantly favor him becoming more of a Casey McGehee.
Obviously Hunter Pence and Shane Victorino will be starting everyday next year. That leaves either Domonic Brown or Mayberry as the third outfielder.
With a couple months at Lehigh Valley adjusting in left field, Brown should be ready to go at the start of 2012. The former top prospect in baseball has all of the tools to be a great player.
At 24-years-old entering next year, it's time to start Brown everyday. While still raw defensively, he displayed terrific plate discipline this year, cutting his strikeout-rate in half and almost doubling his walk-rate. He still suffered from some BABIP bad luck and his power potential still lacked, but that could still have been a result of his hamate bone injury before the season.
Unfortunately, with keeping Mayberry on the bench most of the time, the Phillies would not maximize his value. Keeping a potential three win player on the bench next year is a waste.
While Brown improved slightly against lefties this year, he still struggles against them. Platooning Mayberry against lefties certainly would improve the team on a day to day basis, but hurts the future development of Domonic Brown, who needs at bats against lefties to improve. In addition, Mayberry doesn't appear to have a high-split platoon, meaning there isn't much difference for him when facing either a lefty or righty.
The other option is starting Mayberry everyday at the beginning of 2012 with Brown still in the minors. However, there is nothing more for Brown to prove in the minors and only continues preventing future offensive growth.