Nadal :Nadal was 6-1 against Tsitsipas who additionally was not even in good form and Rublev folded like a cheap tent playing his master and idol. Pretty good group for Nadal.
Schwartzman would be a walking bye for him but Zverev just beat him on indoor court in Paris and Medvedev is in top form. It's questionable would he got out of this group.
10-1 vs Schwartzman (5-0 on Hard-courts)
3-0 vs Medvedev (3-0 on Hard-courts)
5-2 vs Zverev (2-2 on Hard-courts)
6-1 vs Tsitsipas (4-0 on Hard-courts)
2-0 vs Rublev (2-0 on Hard-courts)
9-6 vs Thiem (1-2 on Hard Courts)
Essentially there was no difference between Schwartzman/Rublev and Medvedev/Tsitsipas for Rafa he's literally 21-2 against them (14-0 on Hard-courts)
The only "relevant" tough opposition for him was Zverev/Thiem and he got Thiem.