George Coetzee has recorded a first-round 64 to top the leaderboard at the Turkish Airlines Open.
The South African hit eight birdies to establish a one-shot advantage over Denmark's Thorbjorn Olesen.
A group of four players - including Bernd Wiesberger and Matteo Manassero - are a shot further adrift in a share for third position.
England's David Horsey is among eight players in a tie for seventh spot, while Masters champion Danny Willett is down in 21st after a two-under-par round of 69.
Fellow Englishmen Lee Westwood and Tyrrell Hatton are down in ties for 30th and 58th place respectively.
