Final set tie-breaks will be introduced at Wimbledon from next year, the All England Lawn Tennis Club has announced.
The decision comes after the final set between Kevin Anderson and John Isner in this year's Wimbledon men's semi-finals lasted almost three hours.
Afterwards, South African Anderson, who eventually won the set 26-24, called for a rethink of the format.
The AELTC said "the time had come" to introduce a tie-break method at "a reasonable point" in a deciding set.
"While we know the instances of matches extending deep into the final set are rare, we feel that a tie-break at 12-12 strikes an equitable balance between allowing players ample opportunity to complete the match to advantage, while also providing certainty that the match will reach a conclusion in an acceptable time frame," said AELTC chairman Philip Brook.