Four Americans are the current leaders of the US Open at Southern Hills in Oklahoma.
Hale Irwin leads the field on two under after 10, with Phil Mickelson and Loren Roberts just behind on one under - again after 10.
Steve Jones is then next on one under after six.
Ireland's Padraig Harrington is currently two over after eight holes.
Meanwhile Darren Clarke has had a nightmare start to the Major tournament - he lies two over after three holes.