Is level 70 the maximum level you can get your created characted?
Because i've seen online other users with their created characters with more than level 70.

Nobody can make a character above 70. That's 560 points divided however they choose. Maybe in player matches you can use the standard players, some of which are bove 70. But for ranked, you must use a created player and they can only be 70.

Level 70 as a created player is better than above for a non created player as you can concentrate on the areas you use.Me and my wife play doubles on world tour so ive created a player with 100 on serve,power,volley and speed as i stay at the net my wife uses 100 on forehand,backhand,speed and power and she plays basline. weve yet to lose a doubles game either lol

So I suppose the reason for players such as Federer or Roddick having 75 and 74 respectively is so that they get further in the tourneys and you will most likely be playing the ones with 70+ in the finals?