Career
At the 2003 Pan Am Games Manswell beat American Devin Vargas in the semifinals, but lost in the final to Cuban Odlanier Solis 3 to 15, giving him yet another silver medal. Manswell lost to Vargas in 2004 at the Olympic Qualifying Tournament and did not continue to the 2004 Summer Olympics. Manswell signed with boxing promoter Don King.
In 2011 Manswell lost three fights in a row.
First KO"d by Bermane Stiverne, then outpointed by undefeated Mike Perez and fringe contender Cedric Boswell.