Question: Who directed a 2015 American sports drama film that was a spin-off and sequel to the "Rocky" film series, the film features a British professional boxer who held the WBC cruiserweight title from 2016 to 2017? 
Sentence (from "Jesse Burnett"): Stars such as his stepson Liberato, a successful businessman, and a brother-in-law Leroy McKenzie better known as Sarge, one of the best in Belizean soccer and a legend in Belize.
Relevant evidence: No