Big Rafa Nadal fan here but money is money, I will bet against him at the Australian Open, he will not go deep in my opinion.
I like the attitude and I wish I could be the same LOL
There are number of occasions I bet for my favorite team/player knowing that they have the chance to lose but I could not resist to bet against them. I know it does not make sense but I bet there are hundreds of people like me around.
This is a very human behavior actually

But the thing I love about my favorite players is that I know them very well, because I support them. Another player I usually know when he will lose is Kei Nishikori, of course I am not right every time but I seem to know him so well because he is one my favorites.
Back on topic, if you are looking for odds @ 1.30 for tomorrow on the Challenger tour, go for this one >
https://www.tennisexplorer.com/match-detail/?id=1762101The Polish player is by far the better player here and should win comfortably, he had a very successful season 2018 and he will progress even more in 2019.