The Open Champion shot a four under par 66 today.
Offaly's Open Champion Shane Lowry carded a 66 to leave him in a tie for 13th on four under par after his opening round of the Travelers Championship.
That leaves him six off the current leader, Canada's Mackenzie Hughes, who carded an amazing round of 60 to top the leaderboard on 10 under.
Earlier in the day, Rory McIlroy shot a 7 under par round of 63 to leave him in second place, three shots off the Canadian.
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