Harrington 'a serious challenge to Woods': Harmon

Golf coaching supremo Butch Harmon believes Padraig Harrington is one of the few players who could seriously challenge Tiger Woods' claim to the US Open crown.

No European has won the title since Tony Jacklin in 1970, but Harrington believes he has learned a lot from partnering Woods in the last two US Opens and beat him head-to-head for a million dollars in the Target World Challenge in California in December.