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 Golden Gaters WTT team in 1974 and reached two WTT Championships in 1975 and 1976. 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 the WTT in 1987 and Executive Director in 1991. Since 2001 she has been the chief executive officer & Commissioner of World Team Tennis, a coed professional tennis league.