Sammy Gutierrez (born 31 December 1985), is a Mexican professional boxer in the Strawweight division. Guty was born in San Martin Texmelucan de Labastida, Puebla, Mexico. On October 23, 2010, he became the interim WBA Minimumweight champion by beating Colombian Luis Carrillo by 3rd round TKO.

Based on that paragraph can we conclude that this sentence is true?
Sammy Gutierrez said that his fight with Luis Carrillo was the toughest of his career.
It's impossible to say