Thorbjørn Olesen and Justin Rose hit the top of the leaderboard midway through the second round of the Turkish Airlines Open as course knowledge came to the fore at Regnum Carya Golf & Spa Resort.
Dane Olesen and England's Rose are the past two winners of this event and they both turned in 30 to get to ten under and lead by one from China's Li Haotong and Englishman Tom Lewis.
Both the leaders are looking to become miltiple Rolex Series winners this week, while a victory for Rose would take him back to the top of the Official World Golf Ranking.
Thai Kiradech Aphibarnrat, Irishman Paul Dunne and Frenchman Alexander Levy were at eight under.
This is a historically low-scoring event and that theme continued as the group in the lead at seven under quickly swelled to seven in the early stages.
Rose holed a 12-footer on the first, with Li birdieing the par-three second and then putting his approach to three feet on the next.
Olesen's approach to the third was a tap-in and when Levy holed from eight feet on the sixth to add to gains on the first and third, he was also in the group at seven under.
The five-time European Tour winner then produced a moment of magic, putting his third at the par-five seventh to within a foot and hitting the front on his own.
Olesen hit a wonderful approach into the fifth to join the lead and Rose followed suit in the group behind before Li made the most of the seventh to make it a four-way tie.
Lewis was next to join the party as he continued to compile what was looking like one of the rounds of the day.
The Portugal Masters champion birdied the first, second and fourth and then holed a long putt on the eighth to turn in 30. A birdie on the 11th was then followed by two putts from the fringe on the par-five 12th and he was eight under.
Danny Willett holed a long putt on the tenth to go with birdies on the first, fourth and ninth, and when Aphibarnrat birdied the ninth to turn in 31 after gains on the second, fourth and seventh and a bogey on the sixth, we were back into a seven-way tie.
That did not last long, however, as Olesen put his tee-shot on the par-three eighth to eight feet and made a birdie.
Rose hated his contact off the eighth tee but the ball was within six feet of the pin and he briefly joined the lead before Olesen made it back-to-back gains from distance on the ninth.
The duo were now going toe-to-toe and Rose put his second to tap-in range on the ninth to turn in 30 and share the lead.
Lewis then holed a long putt on the 14th to become the nearest challenger and he was joined at nine under by Li, who holed from 11 feet at the tenth.
Overnight leader Dunne had three-putted the second but he holed a long putt on the fifth and a ten-footer on the eighth to get to eight under.
Willett had fallen out of that group with a bogey on the 11th and he was seven under alongside fellow Englishmen Sam Horsfield and Tommy Fleetwood, Frenchman Mike Lorenzo-Vera and Spaniard Adrian Otaegui.