Victor Dubuisson shot a stunning 64 to surge to the leaderboard summit in the World Tour Championship, Dubai.
The Frenchman, whose eight-under round included an eagle at the fifth, deposed joint overnight leaders Francesco Molinari and Sergio Garcia to lead Nicolas Colsaerts (66) and English duo Matt Fitzpatrick (66) and Tyrell Hatton (67) by a shot.
Garcia dropped well off the pace with a scrappy 74 - which represented something of a salvage job after going out in 40 - while Molinari's 70 saw him two shots back after Saturday's play.
In the fight for the Race to Dubai title, leader Henrik Stenson closed on five under for the tournament - level with third-placed Rory McIlroy - but the Swede's nearest challenger, Danny Willett, had a miserable day as he carded a 76 that featured only one birdie.
A big move from Victor-- The European Tour (@EuropeanTour) November 19, 2016
Finished: Solo 1st pic.twitter.com/vxx5H8bh6Q
Remarkably, Dubuisson's score was not the lowest of the day, as Rafa Cabrera Bello went round in 63 at Jumeirah Golf Estates, taking the Spaniard to within two of the leader.
A back-nine 30, which saw six birdies, shot Cabrera Bello into contention, leaving him level on 11 under with Molinari and first-round leader Lee Westwood (69), who birdied the 18th to assuage the pain of having found the water on the way to bogeying the same hole on Friday.