Gaelic games
McCloskey played both Gaelic football and hurling at underage and briefly at senior level for the local clubs in Dungiven - St. Canice's Dungiven and Kevin Lynchs respectively. He was part of the Dungiven side that won the Derry Senior Football Championship and Ulster Senior Club Football Championship in 1997.
Amateur career
McCloskey boxed out of the St. Canices ABC and fought for Ireland at amateur level and was a three-time Irish champion and five-time senior Ulster champion at in the light welterweight division. He failed to qualify for the 2004 Summer Olympics by ending up in third place at the 2nd AIBA European 2004 Olympic Qualifying Tournament in Warsaw, Poland.
Professional career
McCloskey turned professional in March 2005 on the undercard of a bill that included Eamonn Magee and Neil Sinclair at the King's Hall, Belfast. In his debut McCloskey defeated experienced Englishman "Dangerous" David Kehoe with a third round knockout.
In December 2007 he won the IBF International light-welterweight title, stopping Tontcho Tontchev in round four.
After beating Nigel Wright on points in July 2008, he fought Colin Lynes on 5 December 2008 for the vacant British light-welterweight title. McCloskey won, forcing Lynes to retire after the ninth round.
Following his British title victory, McCloskey was named Boxer of the Year at the Irish National Boxing Awards in January 2009.
On 13 March, McCloskey retained his British light-welterweight title in emphatic fashion with a fourth-round stoppage of Dean Harrison in Widnes.
McCloskey won the vacant European light welterweight title on 6 November 2009, when he defeated Spanish boxer Daniel Rasilla after original opponent and champion Mbaye withdrew due to injury.
McCloskey defended his European title against Giuseppe Lauri from Italy on 11 June at the Kings Hall, Belfast, with an 11th round knockout.
McCloskey's next defence of his European title was against Barry Morrison in Letterkenny, County Donegal, on 2 October 2010. McCloskey won the fight with a seventh round stoppage of his Scottish opponent.
His third defense of the title would've been against second Italian challenger, Michele Di Rocco on March 5, 2011. Michele Di Rocco has a record of (21-1-1) with 12 kos and his only loss was by knockout in the 7th round against Giuseppe Lauri, whom mccloskey knocked out in the 11th round. But this match has been cancelled due to the Khan fight being worked out.
He lost to Amir Khan at the Manchester Evening News Arena on Saturday 16 April 2011 when the fight was controversially stopped in the sixth round. This was the result of an accidental head butt which left McCloskey with a small cut above his eye. A full investigation by the British Boxing Board of Control is set to take place.
