Martin Kaymer (born 28 December 1984) is a German professional golfer. He became the No. 1 ranked golfer in the Official World Golf Rankings on 27 February 2011 after his runner-up finish in the WGC-Accenture Match Play Championship.
Kaymer was born in Düsseldorf, Germany. He turned professional in 2005 and is a member of the European Tour. He has won nine tournaments on the tour including four in 2010 to win the Race to Dubai, formerly the Order of Merit, for the first time. Among those wins was the 2010 PGA Championship, a victory which made him only the second German to win a major championship, after Bernhard Langer.
Kaymer picked up his first professional win at the age of 20 as an amateur at the Central German Classic in 2005 on the third-tier EPD Tour. He shot a −19 (67–64–66=197) to win the tournament by a margin of five strokes.