Conversation so far:
When did Gennady Golovkin boxing career start?
After ending his amateur career in 2005, Golovkin signed a professional deal with the Universum Box-Promotion (UBP) and made his professional debut in May 2006.
Does it say any of his opponents names?
Golovkin routed Nunez.
Are there any other interesting aspects about this article?
Golovkin was promptly upgraded to WBA (Regular) champion.
Did he win any metals/awards?
the WBA issued an interim title fight between Golovkin, ranked #1 at the time, and Milton Nunez.
Golovkin routed.

Question: Who was his first fight with?
Self-contained rewrite: Who was Gennady Golovkin's first boxing fight with?