Question: Nikolai Valuev is a two time WBA heavyweight champion, having first won the title from what boxer who competed from 1992 to 2010, and was the first Latino boxer to win a heavyweight title?
Sentence (from "John Ruiz"): John Ruiz (born January 4, 1972) is an American former professional boxer who competed from 1992 to 2010.
Relevant evidence: Yes