The American shot an eight-under par course record 64 on day one of the event which has attracted tens of thousands of spectators.
Day 2 begins at 7.30am on Tuesday when Seamus Power tees off, followed by Graeme McDowell at 7.35am and World number 1, Scottie Scheffler at 7.40am.
Limerick Live has reporters and photographers on location providing updates online, on social media and print.
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