Matthias Schwab turned in 31 to extend his lead to two shots on day three of the Turkish Airlines Open.
The Austrian moved to 16 under at The Montgomerie Maxx Royal as he looks to claim a maiden European Tour victory at the sixth Rolex Series event of the season.
He has claimed top fives at the Italian Open and the WGC-HSBC Champions recently to take his top ten tally on the 2019 Race to Dubai to nine and he continued to impress in Antalya.
Frenchman Benjamin Hebert is also looking for a first win after losing the final of the 2018 Belgian Knockout and two play-offs this season, and he was seven under for his round with two to play to sit two back.
Tournament invite Ross Fisher has five European Tour victories and the Englishman turned in 32 to also sit at 14 under.
Another Englishman in Tyrrell Hatton and American Patrick Reed were at 13 under.
Schwab entered the day with a one shot advantage and while he soon had some company, he put his second at the par five first to eight feet for an eagle for the second day in a row to jump two ahead.
Hebert made a big move on the front nine, picking up shots on the first, second, fourth, eighth and ninth.
A lovely deft chip brought him another gain on the par five 11th and moved him within one but he dropped a shot on the next and, when Schwab got up and down on the par five fourth, the lead was three.
Fisher failed to make the most of the first after a three putt but put a tee shot to eight feet at the first to edge closer.
He dropped a shot on the next but followed playing partner Schwab in getting up and down on the fourth, and he holed a long right to lefter on the sixth to get within two.
Hebert then joined him at 12 under as he hit back with a birdie on the par five 13th and he drove the par four 15th to set up a birdie that got him within one.
Reed birdied the third to get to nine under but a run of four birdies around the turn catapulted him right into contention as he birdied the eighth and chipped in at the ninth.
A brilliant bunker shot on the tenth edged him closer and an up and down at the par five 11th had him within two.
Fisher got within one as he holed from 20 feet on the ninth but Schwab followed him in from 15 feet to extend the lead to two once more.
Hatton chipped in at the fourth for an eagle and then birdied the sixth from 15 feet but gave the shot back on the next.
Birdies on the tenth and 12th had him back on the move and he took advantage of the next to get to 13 under.
Frenchman Victor Perez was at 12 under, a shot clear of South African Justin Harding and English duo Lee Westwood and Danny Willett.