1991-04-01 Mike McCallum w pts 12 Sumbu Kalambay, Louis 11 Stadium, Monte Carlo, Monaco - WBA
1991-04-01 Mike McCallum w pts 12 Sumbu Kalambay, Louis 11 Stadium, Monte Carlo, Monaco - WBA. Referee: John Coyle. Scorecards: 116-114, 116-115, 114-115. In what was a very close contest, the champion was ahead after six rounds, scoring well with solid combinations, before Kalambay (159½) picked up the pace and came back very strongly in the second half. It was probably the 11th that settled it for McCallum (159½), when he scored heavily, but Kalambay was never far behind and was always a threat, especially with the left hand.
McCallum forfeited WBA recognition in December when challenging James Toney for the IBF version of the title and a short while later Reggie Johnson was selected to meet Steve Collins to decide the vacancy.