Lar represented Dúrlas Óg at all age levels. His career with the Club will best be remembered for his football success winning Mid and County Under-12 medals in 1993. Remarkably he won no hurling medals and was not a member of the Tipperary under-14 or under-16 panels.
He never played minor hurling with Tipperary. He was a member of the Tipperary Under-21 team in 2001 and 2002. He made his Senior inter-county debut vs. Clare in the 2000 South East Hurling League playing at corner-forward. Lar won a National Hurling League medal in 2001, scoring 4 points in the final and 4-11 in 6 games in the 2001 NHL competition. Lar won his second National Hurling League medal in 2008, scoring 1-3 in the final to earn the man of the match award. Lar scored 5 goals and 10 points in the 2008 NHL campaign. Lar also won a Munster Senior Hurling medal in 2008, scoring 2 points in the final while he scored 2-2 in the 2009 Munster Senior Hurling Final while capturing his third medal.
Lar's fourth Munster Senior Hurling medal came with a memorable man of the match performance, scoring 4-4 from play against Waterford in the 2011 Munster Final. Lar won his 5th Munster Senior Hurling medal in 2012.
Lar won an All-Ireland and Munster Senior medal in 2001, scoring 1-1 in the Munster Final against Limerick and 2 points in the All-Ireland Final. Lar won his second All-Ireland Senior medal in 2010, scoring 3 goals in the Final and winning the RTE man of the match award. Lar scored 6-11 in total during the 2010 Championship. Lar won the 2010 GAA Player of the Month award for September, sponsored by Vodafone following his man of the match performance in the All-Ireland Final.
Lar won a County minor medal with Thurles Sarsfields in 1999 and County Senior medals in 2005, 2009, 2010 and 2012 in addition to a Munster Club Senior Hurling medal in 2012. Lar won an Inter Provincial Hurling medal in 2007, scoring two points from play at corner-forward for Munster in their victory over Connacht. Lar was nominated for All-Star awards in 2008, 2009, 2010 and 2011, winning an All-Star at right half forward in 2009, at left-half forward in 2010 and at full forward in 2011. Lar was nominated along with Killkenny duo Henry Shefflin and Tommy Walsh for the 2009 Hurler of the Year award and won the Hurler of the Year award in 2010.