On the final day of the Ryder Cup, 12 singles matches are played, with everyone going head-to-head in solo contests in one match against a player from the opposing side.
In recent years, the singles matches have been among the most compelling encounters in the entire history of the Ryder Cup.
At the last Ryder Cup in 1999, Europe needed to win just four of the 12 matches to retain the Ryder Cup, but the United States claimed eight-and-a half of the 12 points on offer to pull off an improbable victory.
If a player is injured and cannot compete in the singles, the captain of the opposing team nominates a corresponding player from his own line-up to stand down and not take part.
The 'match' is considered halved and the point is shared, irrespective of which team has the injured party.