Also you have to play so many rounds under 55 to qualify. I do not know the nubers as i was under 55 for a long time so i got made up straight away. Keep plugging away and one day wgt will reward you Lol.
From what previous posters have posted, just like other tiers, a player also needs to have saturated. The saturation for Champion tier is still 200 rounds.
So, to reach TC, a player needs 200 ranked rounds at Champion tier + an average of 55.00 or lower.
I've never seen anyone post that a player also needed to post a certain number of rounds under 55.