Joseph Francis Hagan, or Philadelphia Jack O’Brien, was an agile, quick, limber, two-handed puncher, who landed often, if not particularly hard. His best punches were a left jab and a hard overhand right. The man was a good defensive fighter who blocked punches well and counter-punched accurately.
Coming off a win as the world light heavyweight championship with a 13-round TKO over Bob Fitzsimmons, in San Francisco, California, he challenged the world heavyweight champion, Tommy Burns, on November 28, 1906, in Los Angeles. It was a 20-round draw.