Du Plessis and Michael Hollick were chasing a first DP World Tour win at Golfclub München Eichenried. Du Plessis bogeyed the par-3 17th but still led by two shots heading to the par-5 18th.
Hollick stood at 15 under after missing a par putt on the 16th. Bernd Wiesberger was third at 14 under, with Carlos Ortiz another shot back.