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If you're asking about an official, organized 1vs1 tournament by StarLadder, the answer is: no, such a thing does not exist. 

However, there are unofficial 1vs1 tournaments, as noted by some of my comrades above.
You can easily find out how many subscribers you have on your channel by going to, signing in, clicking on your profile icon in the upper-right corner. You'll see a message below your name that will say "50 subscribers, or something like that.  Screenshot:

Note that subscribers don't magically come to you. You'll need to make your channel something that other people will want to spend time on, by adding some cool art, and, most importantly, adding some cool game play videos :).

Good luck!

By giving them a link to your youtube channel of course :)