In October, Bonneau lost in the first round in singles at the Grand Prix de Tennis de Toulouse to Mark Dickson. He finished the year in Australia where he lost in the first round of the 1985 Australian Open in straight sets to John Frawley. A month later at the Melbourne Outdoor, Bonneau lost again in the first round, to World No. 184 Peter Carlsson. On December 30, he was ranked World No. 175 in singles and No. 421 in doubles.