May 3
HBO PPV - MGM Grand Las Vegas
Floyd Mayweather Jr vs. Marcos Rene Maidana
Amir Khan vs. Luis Collazo
May 10
UFC Fight Night - Cincinatti
Matt Brown vs. Erick Silva
ESPN Boxing Los Angeles, California
Bermane Stiverne vs. Chris Arreola
May 17
Bellator 120 - Southaven, Mississippi
Eddie Alvarez vs. Michael Chandler
Quinton Jackson vs. Muhammed Lawal
Alexander Shlemenko vs. Tito Ortiz
HBO Boxing - Inglewood, California
Viktor Postol vs. Selcuk Aydin
Juan Manuel Marquez vs. Mike Alvarado
May 24
UFC 173 - MGM Grand Las Vegas
Renan Barão vs. T.J. Dillashaw
Dan Henderson vs. Daniel Cormier
Robbie Lawler vs. Jake Ellenberger
Takeya Mizugaki vs. Francisco Rivera
HBO Boxing - Corpus Christi, Texas
Bryant Jennings vs. Mike Perez
Daniel Geale vs. Matthew Macklin
Showtime Boxing - Montreal, Quebec
Adonis Stevenson vs. Andrzej Fonfara
May 31
UFC Fight Night - Berlin
Mark Muñoz vs. Gegard Mousasi
HBO Boxing - Wembley Stadium (!)
Carl Froch vs. George Groves
James DeGale vs. Brandon Gonzales
HBO Boxing - Macao
Nicholas Walters vs. Vic Darchinyan
Simpiwe Vetyeka vs. Nonito Donaire
Chris Avalos vs. Yasutaka Ishimoto
Plus Felix Sturm vs. Sam Soliman earlier in the day (not televised in the U.S)