Martin Kaymer golfer in the world, making him only the second German (after Bernhard Langer) to be the top-ranked golfer in the world. At the time he was the second youngest to reach world number one behind Tiger Woods, soon surpassed by Rory McIlroy in March 2012, who gained the top ranking at age 22. In April, he relinquished his number one ranking after eight weeks to Westwood, who won the Indonesian Masters. After reaching the number one ranking, Kaymer decided to undergo a swing change to be able to move the ball both ways. Frustrated with his disappointing results at the
2017 U.S. Open (golf) regularly with the Greater Milwaukee Open preceded by the Milwaukee Open Invitational About half the field consisted of players who were exempt from qualifying for the U.S. Open. Each player is classified according to the first category in which he qualified, and other categories are shown in parentheses. Ángel Cabrera, Lucas Glover, Dustin Johnson (12,13,14,15), Martin Kaymer (14,15), Graeme McDowell, Rory McIlroy (6,7,13,14,15), Justin Rose (11,14,15), Webb Simpson, Jordan Spieth (5,13,14,15) Brad Dalke (a) Scott Gregory (a) Maverick McNealy (a) Sergio García (12,14,15), Adam Scott (13,14,15), Bubba Watson (13,14,15), Danny Willett (14,15) Ernie Els, Zach Johnson (12), Henrik Stenson (14,15)