South African pair Thriston Lawrence and Branden Grace were one shot back, while Europe’s Ryder Cup captain Luke Donald and Christiaan Bezuidenhout were two shots off the pace on seven under par going into Sunday’s final round.
Belgian Detry carded seven birdies in his third-round 67, finishing with three in a row to shoot up the leaderboard and claim a share of the overnight lead. Dane Hojgaard carded a third successive 69.
"Putting (has been key). I struggled on the greens the first day and I’ve managed to find some great confidence and I’m seeing them roll in," Detry told reporters.
"My game has been in great form for the last couple of months and I feel like everything is clicking again.”
It was a long day for most of the field, with some playing 33 holes after rain had washed out much of the second-round play on Friday.
