|Birthname||Helen Elizabeth Nagelsen|
|born on||23 October 1956 at 08:43 (= 08:43 AM )|
|Place||St.Petersburg, Florida, 27n46, 82w41|
|Timezone||EST h5w (is standard time)|
|Astrology data||00°08' 18°33 Asc. 26°38'|
American former professional tennis player first noted as the world's top junior in 1973. She won the 1973 U.S. Champion Girls' 16 and under singles. She also won the USTA Girls' Sportsmanship Award in 1974. As a professional, she won the doubles championship at the 1978 and 1980 Australian Opens (with Renáta Tomanová and Martina Navratilova, respectively), and reached the singles final of the 1978 Australian Open, losing to Christine O'Neil. Over her 21-year career on the WTA Tour, Nagelsen won 26 doubles titles and four singles titles.
Nagelsen reached her career-high singles ranking by the end of 1981, when she became the world No. 23. She also reached a career-high ranking in doubles of No. 11 on 4 March 1988. She had career wins over Martina Navratilova, Arantxa Sánchez Vicario, Sue Barker, Pam Shriver, Claudia Kohde-Kilsch, Rosie Casals, Betty Stöve, and Sylvia Hanika. She was a four-time member of the U.S. Wightman Cup Team in 1974, 1985, 1988 and 1989.
After her retirement in 1996, Nagelsen became a commentator for ABC and ESPN in the United States and Australia's Nine Network. She married Mark McCormack, founder of the sports management group IMG. The couple donated money for the McCormack-Nagelsen Tennis Center at the College of William and Mary in Williamsburg, Virginia.
- associate relationship with Navratilova, Martina (born 18 October 1956). Notes: Tennis doubles partners
- opponent/rival/enemy relationship with Sánchez Vicario, Arantxa (born 18 December 1971). Notes: Tennis opponents
- Work : Retired 1996 (From pro tennis playing)
Sy Scholfield provided copy of birth notice, Tampa Bay Times (St. Petersburg, Florida), 24 Oct 1956, page 21.
- Family : Relationship : Mate - Noted (Mark McCormack)
- Vocation : Entertainment : News journalist/ Anchor (Sports commentator)
- Vocation : Sports : Tennis
- Notable : Famous : Top 5% of Profession (World's top junior female tennis player)
- Notable : Famous : Top 5% of Profession (International tennis champion)