Kloss was ranked No. 1 in the world in doubles and No. 19 in singles in 1976. That year, she won doubles titles at the US Open, the Italian Open, the US Clay Courts, the German Open, the British Hard Courts Championship, and Hilton Head, as well as the mixed doubles title at the French Open.Linky Boshoff was her most frequent doubles partner. In 1977 she won the Canadian and German championships and the British clay court championship.
In 1999 Kloss won the US Open doubles and mixed doubles championship on the 35-and-over tour.
Kloss joined the San Francisco Golden GatersWTT team in 1974, and reached the WTT Finals with the team in 1975. She left the Golden Gaters prior to the 1976 season to team in order to fully participate in clay-courttournaments in Europe which conflicted with the WTT schedule. Kloss returned to the Golden Gaters for the 1978 season. In 1983, she coached the Chicago Fyre to a WTT Championship and was named Coach of the Year. In 1985, Kloss was a player and coach for the Miami Beach Breakers, and became vice-president of WTT in 1987, and executive director in 1991. Since 2001, she has been the chief executive officer and commissioner of World TeamTennis.