Nash eventually succeeded Donal Óg Cusack as first-choice goalkeeper and made a combined total of 91 National League and Championship appearances in a career that ended with his last game in 2020.

At inter-provincial level, Nash was selected to play in several championship campaigns with Munster, with his sole Railway Cup medal being won in 2013.

[4] Nash joined the Kanturk club at a young age and played in all grades at juvenile and underage levels as a dual player.

[6] In 2009 Nash was an outfield player with the Kanturk junior football team that defeated Rockchapel to win the Duhallow JAFC title.

On 3 November 2013, Nash was in goal when the Kanturk hurlers faced Éire Óg in the final of the county intermediate championship.

[10][11] On 4 February 2018, Nash won an All-Ireland medal after scoring two points from long-range frees in a 1-18 to 1-17 defeat of St Patrick's Ballyragget in the final.

Nash was just sixteen years old when he joined the Cork minor hurling team in 2001 as sub goalkeeper to Martin Coleman.

After spending two seasons as sub goalkeeper he made his first appearance for the team on 8 June 2005 in a Munster Championship quarter-final defeat of Waterford.

As goalkeeping understudy to Martin Coleman, he won a set of Munster and All-Ireland medals following defeats of Waterford and Kilkenny.

[18] After being ineligible for the team in 2005, Nash was back in goal the following season and won a third Munster medal after a five-point defeat of Tipperary in the final.

[25] As a result of Donal Óg Cusack's suspension, Nash made his championship debut as goalkeeper in a Munster semi-final against Waterford on 17 June 2007.

[27] On 22 April 2012, Nash was introduced as a substitute against Tipperary in the National League semi-final after Donal Óg Cusack ruptured his Achilles tendon.

[28] He scored a point from a free in that game, however, he was left out of the starting fifteen in favour of Martin Coleman for Cork's subsequent league final defeat by Kilkenny.

Conor Lehane and Pa Cronin also scored second-half goals while Patrick Horgan's tenth point of the game gave Cork a one-point lead as injury time came to an end.

[44] After the game footage emerged of a man in a Clare training top taking Nash's bag of sliotars from behind the Cork goal and throwing it into the terrace.

[51][52][53] Nash made his debut as goalkeeper with the Munster inter-provincial team on 15 October 2006 in a 2-17 to 1-16 defeat by Connacht in the Railway Cup semi-final.

[58] Nash's technique gained more prominence when he scored goals from close-in frees in each of the drawn and replayed All-Ireland finals in 2013, in spite of being charged down by Clare goalkeeper Patrick Kelly.

[62] O'Keeffe's save with his thigh sparked a further debate regarding the safety of the penalty technique and the role of the defending goalkeeper.

[63] The GAA's Management Committee quickly clarified the rules in relation to penalties and 20-metre frees insisting that shots should be taken from the full 20 metres out with no rushing the ball from defenders.