Rafa never gave any indication at the time that he was not 100% against Soderling. Before Wimbledon, a few weeks after Roland Garros, he did say that he was bothered by tendenitis in his knees after Madrid. But about his loss to Soderliing, all he had to say was that he lost, not because he wasn't physically fit, but because he didn't play well.Well Nadal apparently was not 100% in that one, so I don't rate it. I also don't know if I would rate this as a huge one since Prizmic looks like a player, I watched him at the end of last season too and he looked decent to me then as well.
Prizmic is a potential star in the making, no doubt about it. He is the reigning junior French Open Champion. However, any 18-year-old not named Alcaraz knocking off the world #1 and GOAT and heavy favourite to win the Australian Open in the first round of the tournament would be a historically mammoth upset. A non-Grand Slam comparable of lesser magnitude would be an unheralded 18-year-old Denis Shapovalov, ranked #143, knocking off Rafa Nadal in Montreal in the round of 16 in 2017. I remember the press conference afterward, and Rafa was upset because the loss prevented him from regaining #1 at the time, calling it the worst loss of the year and among his worst ever. That match remains the second greatest upset in men's Canadian Open/Roger's Cup history, with the exception of German journeyman Hans Plotz incredible win over Bjorn Borg in 1975 round of sixteen. A Prizmic win would have trumped that by tenfold.