question about O/U total games in tennis

[SportGTI]

I'm just starting to get into tennis action and had a question regarding O/U total games. If a set goes into a tie-break, is the total games for that set 12 or 13. In essence, do they count the tie-breaker as a game as well?

Thanks all in advance.

[ANGRYBLACK]

It would be counted as 13 games.

[SportGTI]

Thanks Angry! Much appreciated