U.S. Amateur champion Curtis Luck shot a 9-under 63 on Friday to help Australia open a 16-stroke lead in the World Amateur Team Championship.
After lagging behind teammates Cameron Davis and Harrison Endycott in the event that counts the two best scores from the three-man teams, Luck had nine birdies in a bogey-free round at Iberostar Playa Paraiso. Davis added a 68 for a round total of 13-under 131 and three-day total of 32-under 398 , one off the 54-hole record set by the United States in 2014.
Australia is trying to win the Eisenhower Trophy for the fourth time, following victories in 1958, 1966 and 1996.
Davis topped the individual standings at 14-under 201, two strokes ahead of Luck.
Endycott had a non-counting 73.
Ireland was second. Jack Hume shot 66, Paul McBride 69, and Stuart Grehan 71.
The two-time defending champion United States was third at 15 under. Texas' Scottie Scheffler had a 69, Stanford's Maverick McNealy shot 71, and Oklahoma's Brad Dalke 72.