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James Hahn sits atop the Phoenix Open leaderboard following a superb second-round 65, with Ireland's Shane Lowry slipping back into a tie for fourth place.
Lowry, himself having hit a six-under 65 on the opening day, shared the lead of the tournament with Rickie Fowler and Hideki Matsuyama after the first round.
A score of 70 on Friday at TPC Scottsdale, however, left the County Offaly native on seven-under-par overall, three strokes back from leader Hahn.
The South Korea-born American, who leads by a shot from compatriot Fowler and New Zealander Danny Lee, has recently made a seemingly beneficial equipment change.
“The transition from TaylorMade to PXG has been really easy,” said Hahn after his fine 65.
“Really, the very first day I picked up a PXG driver - 3-wood, irons - the ball is going where I want it to go.
"I'm swinging well. That definitely helps.
“It was very comfortable for me to make a decision and switch over, knowing that the numbers, when I'm swinging it well, are exactly the same.”
Lowry's fellow Irishmen, Paul Dunne and Padraig Harrington, struggled in Arizona. The former appears likely to miss the cut on one-over, while Harrington will certainly not being taking part in the weekend's action, with a 74 and a 72 leaving him on four-over.
By David Maher