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With 42 Grand Slams between them, the pair are undoubtedly two of the greatest in the history of the sport and have produced matches of the highest level across multiple countries and continents.
But in 2017, the duo teamed up for the first time ever as a double act and it was just as magnificent as we hoped it would be.
Representing Team Europe against the rest of the world at the Laver Cup in Prague, Feder and Nadal came up against Americans Sam Querrey and Jack Sock.
They defeated the pair in two sets, recording a 6-4 1-6 (10-5) victory.
The result gave Team Europe a 9-3 lead and they ended up winning 15-9 in the indoor hard court tournament.
For avid tennis fans, it was absolute bliss seeing Nadal and Federer on the same side.
It was the equivalent of seeing Cristiano Ronaldo and Lionel Messi line up alongside one another in a game and they didn't disappoint.
The twosome put on an absolute clinic and were simply too good for their opponents. The crowd at the O2 Arena lapped it up, with Nadal and Federer sharing an embrace after securing the final point.
Federer and Nadal playing on the same doubles team right now on The Tennis Channel. I am basically in heaven.— matthew perry (@MatthewPerry) September 23, 2017
Commenting on being teammates with Nadal, Federer said: "We only ever practiced once together, back at the World Tour Finals, so we don’t show each other a lot. We will always be rivals.
"But this was something very special, it was an absolute pleasure being on the court with Rafa and seeing his decision-making process.
"I understand that people only expect a win from us, but it’s very complicated, we’re playing indoors against the big servers, and I hadn’t played doubles for so long, I was trying to remember what to do. The two of us getting together, our two fan groups having to get together, that was interesting too. It was a success, but this isn’t just about us.
"The celebration of Rod Laver and having John and Bjorn there over-rides the doubles, but this was still an important moment for us."
Last week, Nadal surpassed Federer's tally of 20 Grand Slams when he beat Daniil Medvedev to claim the Australian Open.