A mystery punter has staked what may be the biggest bet in the 176-year history of the Oxford and Cambridge Boat Race.
This year's Oxford crew are the heaviest in Boat Race history
The anonymous man, from Windsor, Berkshire, has put £13,000 on Oxford to win the 151st race on Sunday. If they win he will receive £21,000.
William Hill has cut its price on Oxford from 8/13 to 8/15 because of the huge bet - the most they have ever taken on the university contest.
Cambridge are 11/8 to win, with odds of 33/1 of a boat sinking into the Thames.
This year's Oxford crew are the heaviest in Boat Race history, weighing in at an average of 15st 6.5lbs (98.2kg).
Both the Dark Blues and their optimistic backer will be hoping to reclaim the title from Light Blues Cambridge, who won last year's race after both boats collided.
The victory ended two years of Oxford rule and gave Cambridge a 78-71 lead overall in the 150-tie series.
One race in 1877 ended in a dead heat, and William Hill is offering a price of 100/1 on the same result this year, while Coral gives a price of 150/1.
Rupert Adam, from William Hill, said: "We have been betting on the Boat Race for over 20 years and this is the largest bet we have ever taken on the outcome.
"The Oxford crew are a stone and a half heavier a man than the Cambridge crew, so if we're lucky they might sink."
If the mystery gambler wins his bet, he will take away £8,000 profit, plus his original stake money.