Each of the first two days of the Ryder Cup includes one four-match session of fourballs and one four-match session of foursomes.
Got that? OK, let's go.
What? Oh, sure, here's the difference between the two formats, fourballs and foursomes:
Fourballs: In fourballs, each member of a two-man team plays his own ball, so four balls are in play on every hole. Each team counts the lowest of its two scores on each hole, and the team whose player has the lowest score wins the hole. If the low scores are tied, the hole is halved.