Rory Mc McIlroy leads after day one of the US Open at Congressional.
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The 21 year old hit a round of 65 to give him a 3 shot cushion at the top of the leader board .
Mc McIlroy says it could have been even more.
Graeme McDowell is the next best of the Irish on 1 under after a round of 70 while Padraig Harrington is level par after a bogey on the last.
Shane Lowry is well above the projected cut line on 1 over after a round of 72.
Phil Mickelson is 3 over while Charl Schwartzel and Y.E Yang share second on 3 under.