Girl looks at me twice with serious face but we never talk each other but she know who I am because we are both in a sport group in school?

There was this one girl who was staring at me far away from me inside from our school but we never talk each other but she knew me because we were both in the sport group at school. I was sitting and she was far away from me staring at me for a long time and then when I looked at her back she turned away and looked at the down and I still stare at her because she stare at me at the first place and then she stares back at me again with serious face.
Girl looks at me twice with serious face but we never talk each other but she know who I am because we are both in a sport group in school?
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