Andrew Barton, from Oxfam, said: "All of Oxfam have been cheering Federer's progress for the past couple of weeks.
"The real hero, though, must be Mr Newlife, for his generous gift and his tremendous sporting acumen. It may inspire other people to support Oxfam and our West Africa appeal."
The bookmakers has already paid out £16,750 to the charity from another bet placed by Mr Newlife which wagered £250 at 66/1 that Federer would win 14 Grand Slam events. Oxfam said the payout is enough money to enable the charity to bring food to 10,000 people for an entire month.
Mr Newlife died in 2009, aged 59, leaving his estate to Oxfam, who now collect £101,840.
William Hill said: "Mr Newlife told had identified Roger Federer as a future serial winner & wanted to place a 'sizeable' long term wager on him.This is one of the most remarkable bets we have ever accepted."
The entire nation will be backing Andy Murray today in his bid to become the first man to win a singles title at Wimbledon since 1936. But if his Swiss opponent, Roger Federer, won then there would be some compensation for an Oxfordshire based charity.
Oxfam could reap more than £100,000 if a late benefactor's wager comes off. In 2003 Nick Newlife, from Oxfordshire, put £1,520 on Federer winning seven Wimbledon titles by 2019, at odds of 66/1. He died in 2009 but left the betting slip, potentially worth £101,840, to Oxfam in his will.
An Oxford gambler who spotted the Wimbledon-winning potential of Roger Federer nine years ago and staked a hefty bet on him winning the tournament seven times could help a charity even after his death.
Nick Newlife passed away before being able to see his wager, which could generate £100,000 of winnings, come to fruition.
But kind-hearted Nick left the William Hill bet in his will to Oxfam.
The charity can claim the winnings if Federer gets the additional Wimbledon title
this year, or any year up to 2019.