Question: What was the nickname of the reigning, retired heavyweight champion at the time of the Fitzsimmons vs. Sharkey Heavyweight Championship boxing match?
Sentence (from "James J. Corbett"): Despite a career spanning only 20 bouts, Corbett faced the best competition his era had to offer; squaring off with a total of 9 fighters who would later be enshrined alongside him in the International Boxing Hall of Fame.
Relevant evidence: No