The Lanark Golf Club event, won by Derek Flynn's team from the Lanark barber's, was contested by 21 quartets who contributed towards the massive cheque for the Beatson Oncology Centre Fund.
The mum of Gordon (a young man who died from a tumour at the age of 24 in 1997), was thrilled that the tournament managed to raise so much in her son's name.
"I'm over the moon with the total made," Jean Cowan told Gazette Sport.
"The Beatson people are overwhelmed with the amount of cash raised and the fact that his friends are keeping Gordon in their memory 13 years after he died."
Rab, who was similarly delighted with the total raised, couldn't play in this year's Gordon Cowan Memorial Golf Day due to injury.
He said: "Murray Brooke's team — the one I would have been in — did well and managed to finish second. I think that tells you a story!
"It's terrific that we've now managed to raise 35,000 for the Beatson in the past four years.
"It is a great day in Gordon's memory and hopefully it will help others.
"Thanks very much to Lanark Golf Club for their hospitality. They've been fantastic."
Rab revealed that Gordon had been a keen golfer who was a member at Douglas Water Golf Club.