Here are some of the people in the sports world celebrating birthdays on September 13

Michael Johnson
Age: 45
Profession: Retired Olympian
Best Known For: One of the greatest sprinters of all-time, Michael Johnson won four Olympic gold medals and eight World Championships from 1991 to 2000. He is the only man ever to win both the 200 and 400 meters at the same Games, which he did at the 1996 Summer Olympics in Atlanta. Johnson still holds both the world and Olympic records in the 400 meters.

Bernie Williams
Age: 44
Profession: Retired MLB Player
Best Known For: A five-time All-Star outfielder, Bernie WIlliams played with the New York Yankees from 1991 to 2006. He won four Gold Glove Awards and one Silver Slugger Award as the best offensive player at his position. He was a member of the Yankees' teams that won the World Series in 1996, 1998, 1999 and 2000. A classically trained guitarist, Williams has toured as a musician since his retirement.

Daisuke Matsuzaka
Age: 32
Profession: MLB Player
Best Known For: After having an All-Star career in Japan, Daisuke Matsuzaka has become a successful pitcher in American baseball. With the Boston Red Sox since 2007, Matsuzaka was a member of the team that won the World Series his first year. Matsuzaka was selected as the Most Valuable Player of the first two World Baseball Classic tournaments in 2006 and 2009.

Age: 30
Profession: NBA Player
Best Known For: Born Maybyner Rodney Hilário in Brazil, Nene plays both forward and center for the Washington Wizards. He debuted in the NBA in 2002 with the Denver Nuggets, making the NBA All-Rookie First Team in 2003.

Rickie Weeks
Age: 30
Profession: MLB Player
Best Known For: An All-Star second baseman with speed and power, Rickie Weeks has played for the Milwaukee Brewers since 2003.