Keep It Low
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By the time he was 17, Teltscher was ranked in the top 10 nationally in junior rankings.
He was an All-American in his only year at UCLA (1978), which he attended on a tennis scholarship.
That same year he defeated Onny Parun to capture the Benson & Hedges New Zealand Open at Stanley Street, Auckland, in a match best remembered for a controversial overrule midway through the third set.
 Pro career
In 1979, Teltscher turned pro. A worldwide top 10 player from 1980-82, he was ranked no lower than #15 from through 1984. He reached his highest singles ATP-ranking on May 7, 1982, when he became ranked #6 in the world.
He reached the French Open doubles final with partner Terry Moor in 1981, and won the French Open mixed doubles title with Barbara Jordan two years later. He also reached the quarterfinals at the U.S. Open three times (1980, 1981, and 1983 -- losing to Jimmy Connors all three years), and the quarterfinals at the 1983 Australian Open. In March 1987 he beat Connors, ranked # 8 in the world, in Chicago 6-3, 6-1. He won 10 singles titles during his professional career, which ended in 1988.
Looking back at his career, Teltscher expressed pride at the time his honesty took over from his competitive nature. During a match at the Masters Tournament against Vitas Gerulaitis, his racket grazed the net while it was match point. No one, including Gerulitis, was aware of the rule violation except for Teltscher. Rather than let it pass, however, he informed the judges of the infraction and lost the point, and maybe the match, because of his honesty. His parents are most proud of him for that action.
 Davis Cup
Teltscher was on the U.S. Davis Cup team in 1982, 1983, and 1985. He had a combined record of 5-4 in singles play, and helped the U.S. win the Davis Cup in 1982 over France.