Updated - Federer/Nadal/Djokovic - Grand Slams Won/Losses to Eventual Champion

[McEnroeisanartist]

Updated after 2020 Australian Open - Grand Slams Won/Losses to Eventual Champion

Federer - 20 and 21 losses to eventual champion of 79 Grand Slam appearances (51.9%)
Australian Open 6 and 6
French Open 1 and 7
Wimbledon 8 and 4
US Open 5 and 4

Nadal - 19 and 10 losses to eventual champion of 59 Grand Slam appearances (49.2%)
Australian Open 1 and 4
French Open 12 and 0
Wimbledon 2 and 4
US Open 4 and 2

Djokovic 17 Won and 18 losses to eventual champion of 60 Grand Slam appearances (58.3%)
Australian Open 8 and 3
French Open 1 and 7
Wimbledon 5 and 2
US Open 3 and 6

 

[UnderratedSlam]

The numbers are so similar to their slam-finale success rate/numbers that they're almost uninteresting...