The United States Open Championship, commonly known as the U.S. Open, is the annual open golf tournament of the United States. It is the second of the four major championships in golf, and is on the official schedule of both the PGA Tour and the European Tour. It is staged by the United States Golf Association (USGA) in mid-June, scheduled so that, if there are no weather delays, the final round is played on the third Sunday, which is Father's Day.

The U.S. Open is staged at a variety of courses, set up in such a way that scoring is very difficult with a premium placed on accurate driving. U.S. Open play is characterized by tight scoring at or around par by the leaders, with the winner usually emerging at around even par. A U.S. Open course is seldom beaten severely, and there have been many over-par wins (in part because par is usually set at 70 except for the very longest courses). Normally, an Open course is quite long and will have a high cut of primary rough (termed "Open rough" by the American press and fans), undulating greens (such as at Pinehurst No. 2 in 2005, which was described by Johnny Miller of NBC as "like trying to hit a ball on top of a VW Beetle"), and pinched fairways (especially on what are expected to be less difficult holes). Some courses that are attempting to get into the rotation for the U.S. Open will undergo renovations to develop these features. Rees Jones is the most notable of the "Open Doctors" who take on these projects; his father Robert Trent Jones had filled that role earlier. As with any professional golf tournament, the available space surrounding the course (for spectators, among other considerations) and local infrastructure also factor into deciding which courses will host the event.

The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.

At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity). Per capita income is the world's sixth-highest.

Lamar Hunt (August 2, 1932 – December 13, 2006) was an American sportsman and promoter of American football, soccer, basketball, and ice hockey in the United States and an inductee into three sports' halls of fame. He was one of the founders of the American Football League (AFL) and Major League Soccer (MLS), as well as MLS predecessor the North American Soccer League (NASL). He was also the founder and owner of the National Football League's Kansas City Chiefs, the Kansas City Wizards and at his death owned two MLS teams, Columbus Crew and FC Dallas. The oldest ongoing national soccer tournament in the U.S., the U.S. Open Cup (founded 1914) now bears his name in honor of his pioneering role in that sport stateside. In Kansas City, Hunt also helped establish the Worlds of Fun and Oceans of Fun theme parks. He was inducted into the Pro Football Hall of Fame in 1972; into the National Soccer Hall of Fame in 1982; and into the International Tennis Hall of Fame in 1993. The National Soccer Hall of Fame bestowed upon Hunt their Medal of Honor in 1999, an award given to only 3 recipients in history thus far. He was married for 42 years to his second wife Norma, and had four children, Sharron, Lamar Jr., Daniel, and Clark Hunt.

Eldrick Tont "Tiger" Woods (born December 30, 1975) is an American professional golfer whose achievements to date rank him among the most successful golfers of all time. Formerly the World No. 1, he is the highest-paid professional athlete in the world, having earned an estimated US$90.5 million from winnings and endorsements in 2010.

Woods turned professional in 1996, and by April 1997 he had already won his first major, the 1997 Masters. He first reached the number one position in the world rankings in June 1997. Through the 2000s, Woods was the dominant force in golf, spending 264 weeks from August 1999 to September 2004 and 281 weeks from June 2005 to October 2010 as world number one. From December 2009 to early April 2010, Woods took leave from professional golf to focus on his marriage after he admitted infidelity. His multiple infidelities were revealed by several different women, through many worldwide media sources. This was followed by a loss of form, and his ranking gradually fell to a low of #58 in November 2011. He snapped a career-long winless streak of 107 weeks when he captured the Chevron World Challenge in December 2011. As of April 8, 2012, he is ranked #8.

Mathias Boe (born July 11, 1980) is a male badminton player from Denmark.

He won the silver medal at the 2006 European Badminton Championships in men's doubles, with Carsten Mogensen.

In 2010, Mogensen and Boe won the titles at the Denmark Super Series, French Super Series and the Super Series Final held in Taipei. One year later Mogensen and Boe won the All England Super Series.