Harrington leads by two in Buick Invitational

Padraig Harrington believes last night’s tournament-leading 64 at the World Golf Championships-Bridgestone Invitational was his best round of golf since winning the US PGA Championship almost exactly a year ago.

The Dubliner's bogey-free, six-under-par round at Firestone Country Club was his lowest score of 2009 after the three-time major winner devoted the first half of the year to improving his swing.