The Presidents Cup is a series of men's golf matches between a United States team and an International Team representing the rest of the world less Europe, created and organized by the PGA Tour, which competes against the U.S. in a similar but considerably older event, the Ryder Cup, and the event is held biennially. Initially it was held in even numbered years, with the Ryder Cup being held in odd numbered years, but the cancellation of the 2001 Ryder Cup due to 9/11 pushed both tournaments back a year, and the Presidents Cup is now held in odd numbered years.
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Alternately it’s hosted in the U.S. and elsewhere in the world. The format is drawn from the Ryder Cup, consisting of twelve players per side and a non-playing captain, usually a highly respected golf figure, who is responsible for pairing the teams in the doubles events, which consist of both alternate shot and best ball formats. The format of the Presidents Cup is different from that of the Ryder Cup mainly in that it includes six extra matches, which prevents a team from hiding its weaknesses. At the inaugural Presidents Cup former U.S. President Gerald Ford was Honorary Chairman. In 2003, 2005 and 2007, Jack Nicklaus captained the United States team and Gary Player captained the International team, and the 2007 teams were announced one day after completion of the year's final major PGA Championship, on August 13.