Question: Until which year did this Polish professional boxer who lost to Joe Smith Jr. in 2016 in a knockout victory hold the IBO light heavyweight title?
Sentence (from "Joe Smith Jr."): He rose to prominence in 2016 by scoring an upset knockout victory over Andrzej Fonfara, and later becoming the first boxer to score a stoppage victory over former world champion Bernard Hopkins, who retired after their fight.
Relevant evidence: Yes