The pupil has beaten the master with Irish trainer Joseph O'Brien getting one-up on his famous father Aidan after Rekindling won the Melbourne Cup.
The youngest horse in the race as a three-year-old to northern hemisphere time, Rekindling was sent out by the youngest trainer for the most prolific owner in the race's history, Lloyd Williams.
Tuesday's win was Williams' sixth and jockey Corey Brown's second but a whole new experience for 24-year-old O'Brien who began training last year after a successful career as a jockey until weight got the better of him.
Williams, who had six horses in the Cup (3200m) including runner-up Johannes Vermeer who is trained by Aidan O'Brien, identified Joseph O'Brien as the trainer he wanted when he bought Rekindling to run in the race he is making his own.
As the son of the world's most prolific trainer, Joseph has always expected he would follow his father Aidan.
On Tuesday, the 24-year-old Irishman did something his father has not, winning the Melbourne Cup with Rekindling.
"I always wanted to train," O'Brien said.
"It was what I was always going to do.
"When I became a jockey I intended riding 20 winners which you can do and then become an amateur rider in Ireland.
"I was a bit more successful than I thought I would be."
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That is a modest understatement with O'Brien twice Ireland's champion jockey and a prolific Group One winner.
Among his major European victories are two Epsom Derbys on Camelot (2012) and Australia (2014), and many wins at Royal Ascot including the 2012 Prince Of Wales's Stakes on dual Cox Plate winner, Australian horse So You Think.
He also won the 2011 Breeders' Cup Turf on St Nicholas Abbey and the Dubai Sheema Classic on the same horse two years later.
After battling his weight for many years, O'Brien called time on his riding career in March last year and set up stables about an hour from his father's famous Ballydoyle establishment.
He claimed his first Group One win in last year's Moyglare Stakes with Intricately.
He has been anointed by Williams to take over from his father as the world's best and his Cup win will go a long way to that prediction.
"I can hardly believe it," he said.
"I have spoken to Dad on the phone. It hasn't really sunk in yet."