[2] Olusegun scored one other significant victory, a 6th-round knockout of Namibia's Ali Nuumbembe in June 2006 before getting the chance a year later to fight for the vacant Commonwealth light welterweight title against Stoke's Gary Reid.
[4] Following the defence Olusegun won three non-title fights with the intention of staying busy whilst calling out the likes of former WBC champion Junior Witter.
[8] Rather than defending the British belt however Olusegun gave it up choosing to take the opportunity to fight in a World title eliminator instead against undefeated Romanian boxer Ionut Dan in a bout which was scheduled take place on 9 October 2009.
Olusegun, now the WBC's number 2 ranked boxer next fought on the undercard of David Haye's heavyweight title defence against John Ruiz at the MEN Arena in Manchester.
[10] On 12 February 2011 Olusegun competed in a non-title six round fight beating Polish journeyman Arek Malek with a World title eliminator still not having come to fruition.
[2] Olusegun finally became the mandatory challenger for the WBC light welterweight title on 30 September 2011 with a win over Frenchman Ali Chebah in California.