I'm new to this but club AI level is too easy for me so I decided to play on junior. But this is too hard for me. First service, perfect speed, on centre service line but AI manage to hit it back to me, then I was playing really aggresivelly-shots from left to right and from right to left on the lines just few centimeters near to out. But AI manage all these shots hit back to me

But this isn't all. In first games of match I have perfect first service-I'm managing to have three aces in a row but how is set coming to end than my first service has (i think) 30% succes. And if I hit first service in these moments it's just too slow like second service. OMG!
And in these moments AI breaks me, I'm not able to take break back because AI is incredible when servicing (really fast shots, no way to catch them) and I'm losing set. Than I often off the match and I wan't to destroy something. And this is just JUNIOR level. I don't want to see what will happen if I will play on harder level...
Please say me: Did I just need to practice or this is serious glitches or purpose from developer to make game harder for player and easier for AI?
Thanks for reading this long text to the end and sorry for my English-it's not my native language.