I'll go with #1 La Monf.
Agreed. Reminds me of an even more spectacular shot Federer hit against Roddick years ago. Check out Roddick's reaction too lol. Always liked his sense of humour.

And this 2 matches were the best ones of the GS 2018
https://www.atpworldtour.com/en/news/best-grand-slam-matches-2018-2-to-1