New Zealander Danny Lee's purple patch continued at the WGC-Bridgestone Invitational, but he has several big names breathing down his neck.
Danny Lee brought his hot form in the first round of the WGC-Bridgestone Invitational, taking the outright lead with a five-under par 65.
The New Zealander built on his win the Greenbrier Classic in July with a tied-for-third result at the John Deere Classic and he tied for fourth at the Quicken Loans National last week.
Lee, 25, has catapulted himself into golf's elite in 2015, with his ranking having dipped to 233rd after the Honda Classic - but his hot form sees him leading the PGA Tour tournament in Akron, Ohio as the world number 66.
The South Korea-born Lee mixed four birdies with two bogeys on his front nine at Firestone Country Club, but rolled in three birdies in four holes after the turn to set the pace.
Earlier, Graeme McDowell had entered the clubhouse in the lead - after a four-under 66 - but finished the day tied for second with Jim Furyk.
Furyk would have a share of the lead with Lee, had he not bogeyed the par-four 18th.
Rickie Fowler and Justin Rose are two shots off the pace after 67s, while a group of eight featuring several big names are tied for sixth at two under.
Victor Dubuisson, Paul Casey, Lee Westwood, Ian Poulter, Webb Simpson and Henrik Stenson are among those in the extended top-10 after 68s.
Also tied for sixth are Robert Streb and Koumei Oda.
In his first start since his Canadian Open win, Jason Day carded a 69 to be tied for 14th - level with the likes of Dustin Johnson, Keegan Bradley, Hideki Matsuyama, Francesco Molinari and Brooks Koepka.