Peterson and Diaz came out with even exchanges, making it hard for each other to establish command of the early rounds. The southpaw, Diaz came out going blow for blow with the former world champion, Peterson, who was showing his patience as a veteran. Diaz began to move more and was able to land a few combinations while avoiding the counter shots from Peterson.
The quick movement of Diaz wasn't enough to avoid the power shots Peterson was landing to the head and body of the shorter Diaz. This was a back and forward battle, but Peterson was able to win more rounds in this twelve round contest.
This is how the bout was scored. Judges: Brian Costello 114-114, Mark D'Attilio 116-112, Dorothea Perry 117-111.