According to my analysis. Everything points on a Bautista victory.
Bautista is the far more experienced and solid player at this stage.
Bautista should be 100% focused, he knows what an opportunity it is to face Tsitsipas instead of Federer. He knows he must take advantage of that.
He is playing some of the best tennis in his career, probably never been more confident than now.
Should be able to hold nerves and stick to his gameplan and punish Tsitsipas backhand which Federer wasnt able to do.
He will be able to rally longer than Federer, won't give Tsitipas as many free points, and he will have to work more for every point.
Tsitsipas collected the biggest win of his career last match, and that filled him with emotions. He might still be full of emotion comming in to this match, making it very difficult to focus 100%
He peaked in his last match against Federer. Hit the line, saved perfect breakpoints, made clutch points on clutch moments, that happens VERY rarely if ever, twice in 2 matches in a row.
Tsitipas will have a hard time adapting to not being able to play as good as he did vs Federer. And can make him tilt, if he doesnt keep mental game on point.
Bautista will most likely play 100% + even more, as it is a once in a lifetime opportunity for him, to be able to make it to his first ever semis in a grandslam by beating a guy like Tsitsipas instead of someone like Federer. It's a dream for Bautista, and he should be able to take advantage of the opportunity given to him. No way he he should be underdog going into this match-up, but I am saying thank you very much bookies.
Roberto Bautista-Agut to win odds 2+
Cheers.