In his next contest, fighting in the super lightweight division against Antonio DeMarco at the MGM Grand Garden Arena in Las Vegas, Nevada, on 21 June 2015, Barthelemy gained a convincing victory.
Barthelemy showed his versatility early, coming out orthodox before switching up to southpaw midway throughout the first round.
Barthelemy lost a point in the ninth round for excessive low blows, but it wasn’t enough to affect the outcome as he won 99–89 on all three cards.
[13] In the rematch, Relikh managed to get his revenge, clearly being the better man on the night, and getting the unanimous decision victory, while also winning the vacant WBA super lightweight title.
[14] On 27 April, 2019, Barthelemy fought Robert Easter Jr for the vacant WBA interim super lightweight title.