again, this sort of framing shows you don’t understand how statistics work
millions upon millions of low probability events occur every day - this is simply a result of the vast plurality of possible outcomes for many situations. Or to put it another way - if many discrete things can happen, ANYTHING that happens is often - in isolation, when compared to everything that didn't happen - low probability. You just don’t notice these 'low probability events' because they are not interesting to a human brain that is hardwired for pattern recognition.
the probability of any specific player playing any other specific player in the draw is very low - but they all have to play someone. First/early round rematches in grand slams are not unheard of, they are certainly unusual but they do occur from time to time. You noticed this one because the first match was notable and interesting; that is all.
To say that because the first match was notable the ensuing events were fixed is not a statistical conclusion - it's faulty reasoning (i.e. post hoc ergo propter hoc)