Pedzisa mutsara unotevera: Harrington akapedza mavhiki anopfuura 300 ari munyika gumi yepamusoro pakati pa2001 na2010. uye akawana chinzvimbo chake chakanakisa chechitatu zvichitevera kukunda kwake kwechipiri Open Championship. Akatambawo nokuda kweEurope muRyder Cups nhanhatu; kurasikirwa muna 1999 uye
2008, asi vakakunda muna 2002, 2004, 2006 na2010. Akakundawo makwikwi epar-3 kuAugusta National, yakaitwa zuva risati rasvika The Masters, muna 2003 (tie), 2004 uye 2012 (tie).