Sheamus O'Shaunessy after retaining the IWW International Heavyweight Championship on 14 November 2005 O'Shaunessy spent the rest of the year engaged in a rivalry with Vid Vain after losing to his tag team partner Joey Cabray the same night he won the battle royal. On 22 and 23 October they traded wins, leading to O'Shaunessy recruiting help from CJ Summers to help defeat the tag team on 24 October. O'Shaunessy was still unsuccessful to defeat Vain in singles action the following day.
Honda Elysion English Manual Transmission here. Despite these losses, his impressive showings earned him a place against in a guest match for the. Although he put on a proficient exhibit and came close to win, his friend Red Vinny interfered in the match and cost him the championship. In March 2005, he avenged this loss by teaming with to defeat Shane and Vinny.
This victory was part of a winning streak over the end of March where O'Shaunessy wrestled twice a day on 24, 25, 26 – including an 11-man Rumble win – and 27 March with a standard tag match and a ten-man tag team match. This series of victories, aside from one loss by to Vain, put him to a good form for the one-day tournament held in to crown the inaugural. On 28 March, O'Shaunessy put an end to his main rivalries when he defeated Vinny and then Vain in the quarter and semi finals, respectively. He met in the final match and won to become IWW's first champion, but had to compete again in an evening show in Dublin, defeating Burridge and Vinny once more in a tag match alongside Vain. O'Shaunessy's first successful title defence came against Burridge the following month but Burridge would not let his grudge rest, continuing to attack O'Shaunessy and finally costing him the title during a match against on 29 May. O'Shaunessy earned revenge in July by defeating Burridge in a grudge match, though lost to him in an contest the following day.