This match, Alcaraz vs Djokovic, is going to be a classic. In fact, Roland Garros produces a classic semifinal every 2 years :
2009 : Federer d. Del Potro in 5
2011 : Federer d. Djokovic in 4
2013 : Nadal d. Djokovic in 5
2015 : Djokovic d. Murray in 5
2017 : Wawrinka d. Murray in 5
2019 ...