"I mean tonight was brutal", he said.
Serbia joins host Australia, which qualified for the Final Eight from Group F on Sunday.
Weeks after leading Spain to the Davis Cup title, the traditional men's team event, Nadal is doing his best to do it again at the ATP Cup, the newest of the worldwide team competitions.
The 24-team, 6-group event is being played in Brisbane, Perth and Sydney from January 3-12, with the quarterfinal knock-out stage beginning on Thursday the 9th in Sydney.
Kyrgios has beaten Djokovic both times they've played and said although he expected the 32-year-old to overtake Roger Federer in terms of most major singles titles won, it doesn't mean he would claim the mantle as the greatest male player ever.
"It's a huge motivation for him I'm sure", former world number two Corretja, who will be part of broadcaster Eurosport's team of analysts in Melbourne, told Reuters on Tuesday. In Group B in Perth, Japan beat Georgia 2-1 and Spain swept Uruguay 3-0.
South Africa, led by Anderson, remains in position after clean 3-fold Chile, 3-0, in Brisbane.
He came on court after teammate and world number 10 Roberto Bautista Agut made short work of Franco Roncadelli 6-1, 6-2. I played a very solid match, my serve worked better than on day one, "said Nadal".
Novak in this set was too good for Monfils and consequently he won 6-2 after breaking the French Player in the 3 (2-1) and in the 5 (4-1) game.
"Obviously playing Gael, you know you are going to have a lot of exchanges, a lot of rallies". "Definitely got off to a little bit of a nervous start but I am really pleased with the way I was able to turn it around and felt pretty much went toe-to-toe from midway through the first set through the rest of the match". He is a great fighter and a great friend of mine.
World No. 4 Dominic Thiem rebounded from a shock loss in his opening game to defeat Diego Schwartzman in two tough sets to send Austria to victory over Argentina in Sydney. "I think just more time and days before the match is probably more valuable than, arguably more valuable, than just being out there".
It kept Austria alive in Group E after they lost their opening tie to Croatia.
"I had the match under control, 5-2 against a good player like Nikoloz. The things I'm doing, the things we're working on seeing", said Anderson, who missed the second half of a year ago after suffering a knee injury at Wimbledon.
Kyrgios ignited the feud with Djokovic early past year in a memorable podcast with well-known tennis journalist Ben Rothenberg, in which he said Djokovic "just wants to be liked".
After the match the 24-year-old explained his strategy was to play to Basilashvili's weaknesses.
The match between Spain and Uruguay which ended in a 3-0 victory.
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