Jacquelin, who is seeking his first European Tour victory since 2007, carded three birdies and a bogey in Saturday's third round for a three-round score of nine-under-par 204.
Jaquelin played well enough in the stretch Saturday to move past Wall, who stumbled with three bogeys in the round. Both players finished up with a par on the tough 18th hole.
"I was just trying to concentrate only on my game, and I am really pleased with the way that I am hitting the ball at the moment," Jacquelin said.
Sunday's round won't necessarily be a showdown between Jacquelin and Wall. Phillip Price and Jamie Elson are tied for third at six-under with nine players right behind them at five-under.