Could be fun to store stats like: win rate, average game length, number of times you've played with each other player, the person you've played with most, the person you've played against most, your nemesis (the person who won against you the most), total games played, average number of games played per session (or per hour), etc.
Could be fun to store stats like: win rate, average game length, number of times you've played with each other player, the person you've played with most, the person you've played against most, your nemesis (the person who won against you the most), total games played, average number of games played per session (or per hour), etc.