PO wrote:Hey Man I totally agree with you on the online experience being much more fun and real. The thing is when playing online, I get aced or unreturned serve %60-70 of the time and the rest is pretty bad returns which happens to end with an easy winner from the opponent. This breaks my will as it seems to me like I almost have no chance to break my opponent

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On the other hand, to beat Master 8, I really need some time to do that I guess

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By the way, when you guys say that I need to at least handle Master 1 for instance (what Pidzi sugessted), is it like two bagels or a competitive score would also be fine?

Ah yeah I read "Master 8" instead of 'Pro" sorry, my mistake ! Indeed, pro is certainly a bit too short for challengers Pidzi is right.
About your service return, we all went through that step. It's the first big thing to figure out to compete. Personally I lost a lot of match 6-0 6-1 at beginning on the tour because of that. Suddenly, one day you realize you start to return fast services at 200+

The video Pidzi showed you may help ! Also, you can watch videos like the final between Richie and Pidzi on a clay m1000 (Ferrer vs Nadal) on youtube, it can give you a lot of insights about "how to reposition yourself", where to position yourself in relation to the baseline, how to moove, how to select your shots...
By the way, you must learn the technique of "counter" (taping a button at the very last minute in defense, instead of charging/holding --> releasing, which is the usual technique) which produces big deep shots. You must also bind specific keys for Top Spin, Short accelerations, lobs and dropshots in the advanced menu of your controller called "Assign keys" (or something like that, at the bottom).
About your last question I can't say, but I know some people in the top 20-30 who play "only" against master 10, nothing more.