As was expected, Novak was in the league of his own in set number four, breaking the rival in games three and five and converting the fifth match point in game eight to book the spot in the final.
Federer won his record eighth Wimbledon title in 2017, but lost to Djokovic in the final in both 2014 and 2015.
However, Bautista Agut, who had already defeated the Serb twice this year, eventually settled and broke for 2-1 in the second set. Not only is he picking the victor, he's also betting on how many sets the match lasts, how many games the first set goes, and whether there will be a tiebreak.
What time does the semi-final clash between Roger Federer vs Rafael Nadal Wimbledon 2019 start? Nadal saved two more break points at 4-1 but Federer held serve the rest of the way, clinching the set when the Spaniard netted a forehand.
Continuing his relentless attacking onslaught, Federer forced Nadal into errors to break the Spaniard again in the fourth game of the fourth set to take a stranglehold on proceedings.
Federer hasn't beaten Djokovic in a major final since 2007 in NY, but will carry renewed confidence into Sunday's showdown after upstaging Nadal for only the fourth time in 14 grand slam encounters.
Seeded 23rd, Bautista Agut was as surprised by his march to Wimbledon's semifinal as anyone, having scheduled his bachelor party in Ibiza for the tournament's final weekend.
Down 3-1, Federer all but surrendered the set with half-hearted returns as Nadal levelled the semi up.
The battle continued in the third set, and it was Federer who broke first in the fourth game before then saving three break points the game after. And the first time it happened, in 2008, he won the title after beating Federer in a five-set marathon.
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Elena Delle Donne and A’ja Wilson are All-Star captains
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Djokovic, increasingly irritated by a restless crowd, broke for 4-2 in the third set and held for 5-2 off the back of a lung-busting 45-shot rally.
The victor will advance to the final, where he will face either Djokovic or Bautista Agut. He dropped the first set against Nishikori, but then dropped just nine total games over the next three sets on his way to a dominant victory.
Djokovic is looking for his fifth Wimbledon title, while Bautista Agut is appearing in his first Grand Slam semifinal.
The latest installment in the Roger vs. Rafa rivalry at Wimbledon is coming to Centre Court.
Nadal emerged triumphant that day, winning in five sets in a four-hour 48-minute epic of fluctuating fortunes that stretched out over seven hours because of constant, momentum-shifting rain interruptions.
Roger Federer was in sublime form against Rafael Nadal in their classic seminfinal.
Federer beat Nadal in the Grand Slam tournament's previous two finals.
In Friday's first match at Centre Court, defending champion Novak Djokovic faces Roberto Bautista Agut, a Spaniard playing in his first Grand Slam semifinal.