Depends on the sport. I used to play pickup basketball. Whereas I recognized the players week to week, I never knew any of them. I only accidentally ran into one of them outside the game once. BTW, I loved the game and remember the players well. They just weren't friends.

Then I sailed, crewed raceboats. I got to know many people quite well. There's a lot of social coordination and communication in sailing. Just sitting on the rail on an upwind beat is a conversation, the same conversation every time but like chicken soup for the soul. Also a good crew is lot like a startup. Not easy to break into but worth it.