Conversation so far:
When was Gennady Golovkin's first fight?
As a youth, Gennady Golovkin would walk the streets picking fights with grown men and be told to fight.
Who were some of the boxers that Gennady Golovkin fought?
Gennady Golovkin has fought Lemieux, Brook, and Jacobs.
Did Gennady Golovkin win the Milton Nunez fight?
Yes, Gennady Golovkin won by KO
What were the CompuStats on the Golovkin Nunez fight?
Who else did Golovkin fight besids Milton Nunez, Lemieux, Brook, and Jacobs?
Gennady Golovkin fought against Canelo Álvarez
Who were boxers Gennady Golovkin knocked out?
Gennady Golovkin knocked out Matthew Macklin, Nilson Julio Tapia, John Anderson Carvalho, and Tshepo Mashego

Question: Which titles did he win?
Self-contained rewrite: Which titles did Gennady Golovkin win?