Missing 2017 AO and 2018 Wimbledon may (WILL?) come back to haunt him - maybe forever. And that's if Federer stays put @ 20. AND he gets to just tie @ 20 - forget if he falls short - by one or more.
BOTH were sitting ducks he SHOULD have had - regardless.
Granted Federer has had some close calls too BUT there are LOT more of those than ones Nadal can cry over - thereby blunting the hurt - to some degree. Add the proximity to No. 20, No. 32, zero competition, Federer missing his 'last' Wimbledon title(????) etc. and it heightens the pain even more.
To now win three or more Slams, Nadal has to operate with non-existent margin of error - specially if he is counting on some or even one non-clay ones.
Three Roland Garros titles may seem automatic today UNTIL you begin to realize Father Time has been undefeated and his intervention is abrupt and without notice - no matter what. Just ask Thiem, Goffin, Dimitrov, Haironic, Boric Acid..................!!!!!!!!!!!!!!!
Translation: Nadal better get to AT LEAST No. 19 by end of next season AND 'hold' Federer @ 20 AND rekindle Djokovic's marital problems AND not marry Xisca................or else!!!!!!!!