Carl Chang, is the older brother and former coach of which tennis star, a now retired, American professional tennis player, that won 34 top-level professional singles titles?
Carl Chang (tennis) Carl Chang (born February 13, 1969) is the older brother and former coach of tennis star Michael Chang. He was born in Hoboken, New Jersey.
Robert Lansdorp Robert Lansdorp (born 1938, Semarang, Indonesia) is a professional tennis coach. He first rose to international fame in 1979 when his student Tracy Austin became the youngest US Open Women's Singles champion in history at age 16. He has gone on to coach other tennis champions including Pete Sampras, Lindsay Davenport, and Maria Sharapova. He is regarded as an expert on groundstrokes, in particular the forehand, advocating a powerful, flat hitting technique commonly referred to as the "Lansdorp Forehand".