In the Doubles competition of the 1988 Virginia Slims of California tennis tournament, Hana Mandlíková and Wendy Turnbull were the defending champions but they competed with different partners: Mandlíková with Jana Novotná and Turnbull with Zina Garrison.
Hana Mandlíková (born 19 February 1962) is a former professional tennis player from Czechoslovakia who later obtained Australian citizenship.
 During her career, she won four Grand Slam singles titles: the 1980 Australian Open, 1981 French Open, 1985 US Open, and the 1987 Australian Open.
 She was also the runner-up at four Grand Slam singles events, including the Wimbledon finals of 1981 and 1986, and won one Grand Slam women's doubles title, the 1989 US Open with Martina Navratilova.
Jelena Janković (Serbian Cyrillic: Јелена Јанковић, ] , born 28 February 1985) is a Serbian professional tennis player.
 Janković is a former World No. 1 in singles, a ranking achieved preceding her finals appearance at the 2008 US Open.
 Janković's career highlights include winning the 2007 Wimbledon Mixed Doubles title with Jamie Murray, the 2010 Indian Wells Masters, the Internazionali BNL d'Italia twice, in 2007 and 2008, and the aforementioned appearance in the finals of the 2008 US Open.
 She is coached by her brother Marko.
Serbian tennis players Ana Ivanovic and Jelena Janković are both former world No. 1 and have met 12 times so far.
 Their overall head-to-head series is 9–3, in Ivanovic's favor.
 Janković is two years older than Ivanovic, so their paths connect them to play each other.
 They are the first female players to achieve major successes for independent Serbia.
Hana Mandlíková and Wendy Turnbull were the defending champions but they competed with different partners that year, Mandlíková with Jana Novotná and Turnbull with Elizabeth Smylie.
Jamie Murray and Jelena Janković were the defending champions, but Janković chose not to participate, and only Murray competed that year.
This is a list of the main career statistics of Serbian professional tennis player and former World No. 1, Jelena Janković.
 To date, Janković has won 15 WTA singles titles including four WTA Tier I singles titles, one WTA Premier Mandatory singles title and one WTA Premier 5 singles title.
 Janković was also the runner-up in singles at the 2008 US Open, a semi-finalist at the year-ending WTA Tour Championships in 2008, 2009 and 2013 and a quarterfinalist at the 2008 Beijing Olympics.
Jelena Janković and Katarina Srebotnik were the defending champions, but they chose not to compete together.
 Janković played alongside Klára Koukalová, but lost in the second round to Michaëlla Krajicek and Barbora Záhlavová-Strýcová.
 Srebotnik teamed up with Květa Peschke, but lost in the second round to Chan Hao-ching and Chan Yung-jan.
<br>
Jelena Janković was the defending champion, but she lost in the quarterfinals against Alisa Kleybanova.
Francesca Schiavone won in the final 6-3, 6-0 against Olga Govortsova.
Jelenin svet ("Jelena's World") is a 2008 independent documentary film written and directed by Tanja Brzaković, about former World No. 1 female tennis player, Jelena Janković.

Question: Are both Hana Mandlíková and Jelena Janković originally from Eastern Europe?
Answer: yes