Is this a team game?

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ok than can you teach me how to beat a full built(vague i know) master yi with a full build yasuo? check my match history for the builds. I know you need to have CC to control him, but what if you dont, because your arent always going to have it.

Easy. The answer is not to play yasuo in the 1st place.

If you don't have any CC on your team, then you screwed up in champion select and are being punished for it.

If your particular champion doesn't have any hard CC, then avoid fighting Master Yi alone and work together with your team to control him.

Looking at the game in question, the only real CC you had was Jhin's W and Morgana's Q which are both pretty easily avoidable using Alpha Strike.

You drafted poorly and Master Yi took advantage of that weakness in your team composition.

Also, it was a 4v5 so you were kinda screwed either way.