There is much more to Tennis than just what the ATP ranking suggest, there are some players that are a headache for certain players simply because of their strength.
Dimitrov definitely is no slouch when it comes to playing tennis at a top level, and he's a very good player with a very similar style to Roger Federer, he's even nicknamed Baby Fed for that reason. Alcaraz strength comes from being a very physical player, and very mobile, but still have a huge weakness especially with his service, he's never at an advantage even when serving, he barely gets any free point from serving against top opponents.
Dimitrov had all the answers to Alcaraz play in that game, he didn't need to be completely mobile to beat Alcaraz because, even when Alcaraz kept going for the baseline and far corner top spin shots, Dimitrov had the advantage due to his flawless one hand backhand spin, drop or winning shots ability.
This post is a great answer to my question on why would anyone go with a surprise result instead of a
safe bet. I guess you really like tennis and follow it closely. I watch tennis only when there is a Davis Cup tournament and Croatia is playing. Otherwise, it's a boring sport to me.
This is more related to the type of person you are, and maybe you are confident in your selections, this is like in football some coaches make teir plans and plays without see how the other team plays, and others dont makes anything by himself they only try to stop the way the other team play, that coaches normally are fully defensive, and the other ones are more towards attacking.
For me like other said beofre, i put my selections by the way i think but in some cases i cover what the other guy is gonna put if im not 100% sure.
With this explanation I guess I know how I managed to win all rounds in the season one and now in season four I can't get a single win. I guess other teams really got to know my style of play, so they already know how I will answer even before I submit my answers. That's actually good to know because now I can make adjustments to my game