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19-year-old David Mullins rode Rule The World to victory to secure the Grand National for trainer Mouse Morris and owners Gigginstown House Stud.
The Sulamani gelding beat David Bass and The Last Samuri in the run in, with 13-year-old Vics Canvas third, Gilgamboa fourth and Goonyella fifth.
Mullins paid tribute to trainer Morris, who also won the Irish Grand National with Rude Angel this year, after both horse and rider secured their first victory over jumps in the biggest race of the British calendar.
"He's produced this horse, that has never won over fences before [in 14 previous races] and, even walking around a Grand National track [with him] you can see he is a genius," he told Channel 4 Racing.
"He's the best man in the world to prime a horse on the day - and I am very grateful for Gigginstown and [owner] Michael O'Leary for giving me this chance.
"Unbelievable - I couldn't have hoped for things to go better. I had one little mishap at the fourth last, and thank God that came out, but everything went to plan really."
O'Leary, who also owns Cheltenham Gold Cup winner Don Cossack, called the victory "amazing" and paid tribute to Morris, who suffered a family tragedy last summer when his son Christopher died from carbon monoxide poisoning while travelling in Argentina.
"I think I am officially going to give up horse ownership after a Gold Cup and two Grand Nationals - it's amazing," he joked to Channel 4 Racing.
"But I am delighted for Mouse - what a training performance with this horse - he has had two broken pelvises and he brought him back each time.
"He was second in the Irish Grand National, second in the Galway Plate, and to come back and win the biggest prize of all is just incredible."