I am happy for either player. For Tsitsipas, I am glad he is able to beat Medvedev in a major and somewhat clear some mental obstacles against him. In addition, in paper
and in Clay, he should able to beat 9 out of 10 times
in slow night matches unless Medvedev clearly improves his Clay court game. In addition, he learned his lessons from the choke-job he did at the US Open against Coric. Ever since that match, he has now reached three straight SF appearances including forcing Djokovic into 5 sets, beating Nadal from two sets down and now beating Medvedev in a Slam. As long he keeps his head clear, he will soon win his 1st Slam.
As for Medvedev, I am happy that he is able to reach the QF stage of Roland Garros and showed that he can play on Clay and improve his Clay court game. It is just matter of willing to improve his footwork on Clay and willing to be aggressive throughout the match. I am curious to see on what his mindset going to be when Wimbledon comes around. The great thing he will be seeded #2 going into Wimbledon. The bad news is that he could potentially face Federer, Nadal AND Djokovic in succession lol