Ireland’s Paul Dunne will not be eligible for the £1.1m prize money should he become the first amateur to lift the Claret Jug since 1930.
The Wicklow native is the co-leader of the prestigious tournament on the fifth and final day on Monday, with his tee-off time scheduled for 2.30pm.
He’s level on 12 under alongside Louis Oosthuizen and Jason Day, but if Dunne finishes above the two professionals - or any other professional for that matter - he’ll have to concede the prize money to whoever finishes runner-up.
Instead, Dunne would be awarded just £500 as amateurs are not entitled to the full prize kitty, according to the rule book of The Royal and Ancient Golf Club of St Andrews, as below.
— BBC Sport (@BBCSport) July 19, 2015
The rules state "prize money shall be allocated to professional golfers" but there is a clause which allows the Championship Committee to review the situation.
Dunne plans to turn professional later this year and already has major sponsors fighting for his signature following a remarkable performance at The Open to date.
The 22-year-old carded a score of 66 in the Third Round, the lowest an amateur has ever managed in the Open’s 144-year history.
He is also the first amateur to be leading the event after 54 holes since American legend Bobby Jones in 1927.