Alright, let's do this...
Sasuke can't beat Nagato. Nagato's Rinnegan and insane chakra reserves counter every single one of his moves.
Amaterasu, Sasuke's favorite move, gets countered by a Shinra Tensei or Preta Path [
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], and the fact that Nagato can sense it before Sasuke attacks puts him at a great advantage [
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] To put it simply, Sasuke's favorite move to use is basically useless, and will do nothing other than drain him of chakra.
The Susanoo is OP, but there's nothing pointing to him being able to get a hit off on Nagato. Nagato can simply hold back a bit, and attack Sasuke with his summons and the Gedo, which'd definitely tire him out. Even if Amaterasu would be a good technique in order to handle the summons, having to put out around 10 summons, along with the Gedo, will definitely not be an easy task. Not to mention that if needed, Nagato can revive the summons with the Naraka Path [
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] [
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] After (and if) Sasuke manages to take out every single one of his summons, he'd be exhausted, due to the fact that even with the EMS, the Susanoo drains a heckload of chakra. Defending something as large as the summons and the Gedo, while also having to defend against any elemental attacks [
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], Deva Attacks [
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] or Asura attacks [
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-
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],
while Nagato could drain [
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-
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] a bit from the Susanoo from time to time, wouldn't be easy at all.
The Tsukuyomi, along with all other Genjutsu Sasuke has, would be countered by simple sensory abilities [
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]
All of Sasuke's Ninjutsu would be countered by the Preta Path [
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-
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-
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]
Sasuke's physical attacks and Kenjutsu would be countered by Asura Path [
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-
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] or simply by the good ol' Shinra Tensei
Meanwhile, Sasuke would have real trouble countering attacks like Chou Shinra Tensei [
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-
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], and he has absolutely no counters for Chibaku Tensei [
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]
Overall, Sasuke's chances are immensely small, especially due to the fact that Nagato's techniques are exceptionally useful in countering his own, and due to Nagato's Chakra reserves and Stamina being way higher than Sasuke's (referring to the fact that a sick Itachi outlasted Sasuke, and that was when he didn't even have the MS moves, which drain a s***load of chakra [
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] )
In conclusion, no, current Sasuke has no chance of winning, at least not without a nice amount of PnJ