Rory McIlroy revealed the new putter he put into play for the FedEx St. Jude Championship was half an inch longer than his usual Spider - and he didn't even notice until he played 36 holes.
"I may go back, I just wanted to freshen it up," he told reporters before the first leg of the 2023 FedEx Cup playoffs.
McIlroy finds himself in T-6 after three rounds, trailing leader Lucas Glover by five having posted rounds of 67, 66 and 68.
It is a scorable course and McIlroy will need a low one if he is to catch Glover, who is looking for back-to-back wins on the PGA Tour.
Justin Rose flirted with a 59 on day three, but ultimately finished with two pars to card a superb, bogey-free 9-under 61
"He's playing great," said McIlroy. "[He] obviously played great last week. He's a new man with that new putter."
McIlroy revealed he cut the Scotty Cameron down half an inch after realising the difference in length after 36 holes.
Glover, sitting on 14-under, leads Taylor Moore by one going into the final round.
England's Tommy Fleetwood is solo third on 12-under after carding his third consecutive round of 66.
The winner will scoop $3.6m this week. Only 50 of the 70 competing advance to the next leg - the BMW Championship in Chicago - before the field is reduced once again to 30 for the season-ending Tour Championship at East Lake.
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