Born in Baltimore in 1950, Koger took up tennis at age seven or eight.[1] As a young player, she faced racial segregation on the courts of Druid Hill Park in Baltimore.[2] She was the first African American to win the Maryland State Tennis Championships.[2] In 1968, she won the American Tennis Association (ATA)'s National Women's Doubles Championship.[3] In college, she was a multi-sport athlete, including a member of Morgan State's men's tennis team from 1969 to 1972.[3][4] She was one of the first African Americans to play on the Virginia Slims Circuit (the precursor of the WTA Tour), where she played from 1973 to 1977.[3][5]
Koger was hired to coach Haverford's women's tennis team in 1981.[3] The program won multiple conference championships during her tenure.[6][7] In 2016, she retired after 35 years in the position.[6]