Having started off in the pro game in May 2010 and having built a perfect unbeaten record of 25-0-0, Monaghan (age 40) now looks to move into the later stages of his career and step up against some of the top prospects in the division. The longest KO streak that Monaghan has ever had is 4 throughout his 25 fights and his longest winning streak is 25 wins. This started on May 2010 and came to an end on June 2015.
In a memorable debut Monaghan gained a TKO win against Simeon Trigueno in a 4 round contest, becoming the 3rd person to stop Trigueno. Monaghan rise in boxing continued with 13 wins against fighters such as Brian Bernard, Eric Watkins and Billy Bailey.
Michael Glenn was beaten next on March 29th, 2011 meaning Monaghan could maintain his unbeaten streak. Monaghan was the 4th person to go the distance with Glenn. Monaghan fought Michael Glenn in 2011, the result was via UD. Monaghan's win streak of 7 rose to 12 following 5 great wins, becoming the 5th person to stop Anthony Pietrantonio (Round 5 TKO), 7th person to stop Brian Bernard and 2nd person to stop Kentrell Claiborne.
Eric Watkins was up next for Monaghan on March 17th, 2012. Monaghan continued with his winning streak by beating Watkins. Eric Watkins was Monaghan's next opponent of his career in 2012. The fight was scheduled for 6 and Monaghan was the 4th person to go the distance with Watkins. 6 wins followed where Monaghan went on to be the 2nd person to stop Dion Stanley, 3rd person to stop George Armenta and 2nd person to stop Anthony Caputo smith.
Keeping his losses at zero, Monaghan fought on January 25th, 2014 beating Matt Vanda. The win came in the 1st round of a 10 round fight via TKO. Monaghan was the 3rd person to stop Matt in his career.
On April 12th, 2014 Monaghan fought and beat Joe Mccreedy (15-6-2) to continue his unbeaten streak. Becoming the 2nd fighter to stop Mccreedy, Monaghan beat Mccreedy via TKO in the 5th round of a 10 round fight. 2 wins followed taking Monaghan's winning streak to 23 wins.
Monaghan then went on to fight and beat Cleiton Conceicao on May 8th, 2015 maintaining his unbeaten record. In 2015 Monaghan fought his next opponent in Cleiton Conceicao. A challenging 10 round fight that ended in Monaghan's favour as the judges awarded Monaghan the UD victory. Monaghan was the 7th person to defeat Conceicao.
Sean Monaghan retained his unbeaten record in his most recent fight by beating Fulgencio Zuniga on June 13th, 2015, increasing his record to 25 wins. Monaghan was the 4th fighter to stop Zuniga in round 9 of a 10 round fight, Monaghan won via TKO.