Owen Keir Davidson (born 4 October 1943) is a former professional tennis player of the 1960s and 1970s.
Bettina Fulco (born 23 October 1968) is a retired Argentine professional women's tennis player.
 She reached her highest ranking of No. 23 on October 10, 1988.
 Fulco began playing tennis at age 10 at the University Club in her hometown of Mar Del Plata, having been inspired to start because of the increased interest in the sport in Argentina due to Guillermo Vilas' success.
 As a junior, Bettina was among the best in the world, reaching the finals of the Orange Bowl 18-and-under championships in 1986, and finishing second in the rankings in 1986.
 She turned professional in 1987.
 Like many South American players, Bettina Fulco was considered a clay court specialist, and reached the quarterfinals of the French Open in 1988.
 Bettina beat Martina Navratilova in Houston 1994 for her biggest career victory.
 She also achieved victories over Conchita Martínez, Arantxa Sánchez Vicario, Hana Mandlíková, Katerina Maleeva, Manuela Maleeva, Magdalena Maleeva, Claudia Kohde-Kilsch, Lori McNeil and Nathalie Tauziat.
 She retired from professional tennis in 1998.
Manuela Georgieva Maleeva-Fragnière (Bulgarian: Мануела Георгиева Малеева ) (born 14 February 1967) is a Bulgarian former professional tennis player.
 She played on the Women's Tennis Association tour between 1982 and 1994.
 Through her marriage Maleeva began representing Switzerland officially from January 1990 until her retirement in February 1994.
Manuela Maleeva was the defending champion of the singles title at the 1989 Virginia Slims of Kansas tennis tournament but did not compete that year.
The 1988 Virginia Slims of Arizona was a women's tennis tournament played on outdoor hard courts in Phoenix, Arizona in the United States and was part of the Category 2 tier of the 1988 WTA Tour.
 It was the third edition of the tournament and was held from September 12 through September 18, 1988.
 first-seeded Manuela Maleeva won the singles title.
The 1989 European Open was a women's tennis tournament played on outdoor clay courts at the Drizia-Miremont Tennis Club in Geneva, Switzerland that was part of the Category 2 tier of the 1989 WTA Tour.
 The tournament was held from 22 May until 28 May 1989.
 Third-seeded Manuela Maleeva won the singles title
The 1984 WTA Swiss Open was a women's tennis tournament played on outdoor clay courts in Lugano, Switzerland that was part of the 1984 Virginia Slims World Championship Series.
 The tournament was held from 7 May through 13 May 1984.
 Third-seeded Manuela Maleeva won the singles title
The 1987 United Jersey Bank Classic was a women's tennis tournament played on outdoor hard courts at the Ramapo College in Mahwah, New Jersey in the United States and was part of Category 3 tier of the 1987 Virginia Slims World Championship Series.
 It was the 10th edition of the tournament and was held from August 24 through August 30, 1987.
 Third-seeded Manuela Maleeva won the singles title.
Silke Meier (born 13 July 1968) is a former professional tennis player from Germany who played on the WTA tour from 1985 to 1999.
 She reached the third round of the US Open in 1990 and, over her career, recorded victories against Jana Novotná, Helena Suková and Manuela Maleeva.
The 1985 Pan Pacific Open was a women's tennis tournament played on indoor carpet courts in Tokyo, Japan that was part of the Category 4 tier of the 1985 Virginia Slims World Championship Series.
 It was the 10th edition of the tournament and was held from 9 December through 15 December 1985.
 Third-seeded Manuela Maleeva won her second consecutive singles title at the event.

Question: Were Owen Davidson and Manuela Maleeva both professional tennis players?
Answer: yes