part of the ATP Tour Masters 1000 and the WTA 1000. The United States has had considerable success in tennis for many years, with players such as Don Budge, Billie Jean King (12 major singles titles), Chris Evert (18 major singles titles), Jimmy Connors (8 major singles titles), John McEnroe (7 major singles titles), Andre Agassi (8 major singles titles) and Pete Sampras (14 major singles titles), and Ricardo Alonso González (14 major singles titles) dominating their sport in the past. More recently, the Williams sisters, Venus Williams (7 major singles titles) and Serena Williams (23 major singles titles), have been a dominant force in the women's game, and the twin brothers Bob and Mike Bryan have claimed almost all significant career records for men's doubles teams. Track and field USA Track & Field is the governing body for track and field in the United States. It organizes the annual USA Outdoor Track and Field Championships and USA Indoor Track and Field Championships. The Diamond League currently features one round in the United States, the Prefontaine Classic; the series formerly included the Adidas Grand Prix as well. Three of the World Marathon Majors are held in the United States: the Boston Marathon, Chicago Marathon and New York City Marathon. The Freihofer's Run for Women is also an IAAF Road Race Label Event. Amateur organizations such as the National Collegiate Athletic Association and Amateur Athletic Union sanction cross-country running in fall, indoor track and field in winter, and outdoor track and field in spring. Jesse Owens was a notable US track athlete who achieved international fame at the 1936 Summer Olympics in Berlin, Germany, by winning four gold medals: 100 meters, long jump, 200 meters, and 4 × 100-meter relay. He was the most successful athlete at the Games and, as a black man, was credited with "single-handedly crushing Hitler's myth of Aryan supremacy", although he "wasn't invited to the White House to shake hands with the President, either". Americans have frequently set world standards in various disciplines of track and field for both male and female athletes. Tyson Gay and Michael Johnson hold various sprint records for male athletes, while Florence Griffith Joyner set various world sprint records for female athletes. Mary Slaney set many world records for middle-distance disciplines. A turning point occurred in US track in the running boom of the 1970s. After a series of American successes