The firm are guaranteeing the offer from Monday morning in their betting shops, ahead of the Championship which starts on Thursday morning.
Luke Donald has been cut to 12/1 (from 16s) to land his first Major after the world number 1 took the Scottish Open at Castle Stuart.
Rory McIlroy is the 6/1 favourite for Sandwich with Lee Westwood at 10/1 and Donald the third favourite. ALL three players will be available at top price on the High Street from Monday morning.
David Williams of Ladbrokes said: “We’re bracing ourselves for Brit-mania. We won’t be beaten on price on the High Street and we’re sure to have ll three players as blots in our book.
“With the last twelve Majors all having gone to a different player, we’re keeping our fingers crossed that an outsider takes the Claret Jug to make it lucky 13 for the bookies.!