Here are the BWAA Nominations per Rafael Floyd Mayweather Defeated Manny Pacquiao UD12, Andre Berto UD12 Set new financial records of every level against Manny Pacquiao in what was coined Fight of The Century Gennady Golovkin Defeated Martin Murray KO11, Willie Monroe KO6, and David Lemieux KO8 Unified titles to become the WBO, WBA, IBO, IBF MW Champion and hosted first PPV in front of sold-out MSG Roman Gonzales Defeated Valentin Leon KO3, Edgar Sosa KO4, and Brian Viloria KO9 Currently ranked number 1 P4P on most lists Tyson Fury Defeated Christian Hammer KO8 and Wladimir Klitschko UD12 Dethroned Wlad to become the unified WBO, WBA, IBF, IBO HW Champion of the World Canelo Alvarez Defeated James Kirkland KO3 and Miguel Cotto UD12 Beat Miguel Cotto to become the Lineal WBC Middleweight Champion of the world in one of the most anticipated fights of 2015
Honestly I have no idea, this hasn't been a stellar year for anyone in particular, a lot of big one off wins, but no one really doing the double. Glowacki had a great win in stopping Huck yet his other win was Seferi....who cares. Fonfara stopped Chavez Jr and had a FOTY against Cleverly.... but barely won.
If some Eastern Europen dude like Uysk, had beaten Hammer & Vlad as easy as The Furious One did, would you even argue it was close?
I would be inclined to go with Mayweather. He won the most significant fight of the last 30 years or so.