Conversation so far:
Did Gennady Golovkin fight Proksa?
Yes, Gennady Golovkin fought Proksa on September 1, 2012.
How many rounds did the Golovkin vs. Proksa fight go?
The Golovkin vs. Proksa fight lasted 5 rounds.
Was the Golovkin vs. Proksa fight popular with people?
The Golovkin vs. Proksa fight was televised on HBO in the United States and Sky Sports in the UK.

Question: What is his fighting style?
Self-contained rewrite: What is Golokin's fighting style?