[1][2] In 2004, he was the first to score a knockdown against undefeated Olympic gold medalist Andre Ward, who went on to win a unanimous decision over Boone.
Other world champions Boone has faced include Jean Pascal, Erislandy Lara, and Sergey Kovalev (twice).
After improving to 10-3-1, Boone faced future two-time world title contenders Enrique Ornelas, and Anthony Thompson, losing unanimous decisions in each.
After drawing on points against another future title contender in Lajuan Simon, Boone lost a decision to then-undefeated (12-0) Jean Pascal.
Boone at the time was 16-15-2, and on a five-fight losing streak (the first three fights being decision losses to Craig McEwan, Erislandy Lara, and Edwin Rodriguez, respectively).