FOUR-BALL: 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.
FOURSOMES: Each two-man team plays one ball per hole with the players taking turns until each hole is complete. Players alternate hitting tee shots, with one leading off on odd-numbered holes, and the other hitting first on even-numbered holes. The team with the low score on each hole wins that hole. If their scores are tied, the hole is halved.
SINGLES: each match features one player from each team. The player with the lower score on each hole wins that hole. If their scores are tied, the hole is halved.
Unlike stroke play, players don't have to complete each hole in match play. If a player concedes a stroke – almost always a putt – to his opponent, the opponent picks up his ball, takes the score he would have made on the next stroke and moves on to the next hole.
POINTS SYSTEM: Each match is worth one point, with matches ending in a draw worth 1/2 point to each side. The first team to reach 14 ½ points (of the 28 points available) wins the Ryder Cup. If the matches end in a 14-14 draw, the team holding the Ryder Cup retains it. The United States team is the defending champion headed into the 2018 Ryder Cup.
The three days of the matches consist of 28 total matches, each of which is worth one point. There are no extra holes in Ryder Cup matches. Should the two sides be tied after 18 holes, each side earns a halve (1/2 point).