He started his professional career with Lincoln City in 1999, and in 2004 after impressing in the clubs recent play-off campaigns he made a move to Watford.
He became a prime example of a promising player who peaked early on in his career and went on to play in Non-league football with Corby Town, Gainsborough Trinity, Stamford and Boston United.
[citation needed] He started his career at Lincoln City, playing over 100 times for the club and featuring in their Division Three play-off semi-final defeat to AFC Bournemouth in the 2002–03 season.
In January 2009 Mayo cancelled his contract with Notts County by mutual consent, feeling his chances of first team football were limited.
In May 2010 he signed for Gainsborough Trinity[5] but after a disappointing season in which the club narrowly avoided relegation to the Northern Premier League he was amongst a group of players released in May 2011.