Peter O'Brien a frontrunner at 1B for Marlins
Peter O'Brien Stats & Scouting Report — College Baseball, MLB Draft, Prospects - Baseball America
Martín Prado - Wikipedia
Who is Peter O'Brien? - AZ Snake Pit
D-backs OF Peter O'Brien smacks 3-run homer vs. Marlins
Martín Prado - Wikipedia
MLB Trade Deadline 2014: Recap and Report Cards for Every Deal, News, Scores, Highlights, Stats, and Rumors
Royals acquire outfielder Peter O'Brien from Arizona - Royals Review
Arizona Diamondbacks' manager: Peter O'Brien to see work at other positions in minor leagues