How to let someone down easy

Alright so I’m married and have 2 kids but I’m only 24. I recently started playing in a city/college league sport and there’s a younger guy on my team. It’s co Ed and I’m friendly/sarcastic with everyone. I don’t wear my ring when I play because my fingers swell so badly so he doesn’t know I’m married. We don’t small talk, just about the game however I’m beginning to feel like he is into me and I don’t want it to be awkward lol I need help on how to let him know I’m not on the market without it being awkward because we have to see each other 3 nights a week for the next 6 weeks. Help!