[3] O'Neill claimed all honours around him in Ireland at underage levels, as well as playing for Kilkenny U-21 hurling team.

[6] He also lost out on a chance to compete at an Olympic qualifier to Sutherland in an IABA box-off.

[8] In the 2010 European championships he defeated four opponents including medal favourite Sergey Derevyanchenko of Ukraine before losing to Artem Chebotarev of Russia in the final.

[10] He secured automatic Olympic qualification for the 2012 London games in the World Amateur Championships 2011.

At the 2012 Summer Olympics in London he again captained the Irish boxing team, but went out in the last 16 to Stefan Härtel.