Right now, a tiebreak is being played in the Wimbledon 2019 men's final between Djokovic and Federer. This is different from how it was before; in past Wimbledon tournaments, players were required to win the final set by 2 games, leading to the 70-68 score in the final set between Mahut and Isner in 2010.
Is this the first occurrence of a tiebreak in the final set on Wimbledon?
After some research (which took longer than the final tiebreak itself), the Women's fourth round match between Muchova and Pliskova almost featured a final tiebreak, but the set ended in 13-11.
There was a final tiebreak in the Gentlemen's Doubles third round match Kontinen & Peers vs. Ram & Salisbury, so the Men's final was not the first occurrence, but it was the first occurrence in the Singles.
That is, unless the tiebreak rules were different in ancient times; I'm not too sure about that.
2019 is the year when tie-break in the 5th was introduced at both Australian Open and Wimbledon
The Djokovic-Federer final was the first Wimbledon mens's singles match to end in a tie-break
As @Glorfindel pointed out, in doubles it occurred couple days earlier in the 3rd Round
At Australian though, after reaching 6-6, a tie-break until 10 is played (margin of 2 is required obviously).
So French Open remains the only Grand Slam tournament without a tie-break in the 5th.
Before 1971, there was no tie-break in any of the sets actually :)
