How Do I Show Colleges I Play Tennis if I'm Not on My School Team?

Question: How can I show colleges that I play tennis regularly (as an extracurricular) without actually being on my school team? I'm in 9th grade, and my high school tennis team is extremely good, and therefore very hard to make. I do play in USTA tournaments though, and am planning on participating in them more often (~ once a month). Is this enough to present tennis as an extracurricular?

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