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Didn't expect that Alcaraz would loose, but as you say, it is not the end of the world. Even the greatest of all time do loose some matches so nothing unusual that Alcaraz looses a match here. In every sport upsets happen and sometimes you can make some good money out of it also
You should not call the loss from Alcaraz was a surprise, he is not playing the best tennis for a while. He played some great games but check out his performance in the past two months and you will understand why it is not an upset, on the other hand the loss encountered by Novak Djokovic yesterday against Sinner was an upset because Djokovic was unbeaten for 19 consecutive matches.