Thornton, who moved into the lead during Saturday’s third round with a six-under 65 which included a hole-in-one, pipped Tjaart van der Walt on the 18th hole on Sunday for the Saint Omer title.
Both players found the fairway on the event’s concluding hole but after Van der Walt found the bunker with his second stroke, Thornton got onto the green’s fringe before rolling a 30-foot putt within inches of the pin.
A simple tap-in secured the title in France ahead of the South African, with England’s Steve Benson settling for third place having led briefly.
Another Englishman, Robert Dinwiddie, was a stroke further back in fourth place.
- Sports & Recreation
- Tjaart van der Walt