Alona Volodymyrivna Bondarenko Dyachok (; born 13 August 1984) is a Ukrainian former tennis player. Her younger sister Kateryna Bondarenko plays on the WTA Tour. Her career-high singles ranking is No. 19, achieved on 14 April 2008. Alona defeated former world No. 1, Jelena Janković, in the third round of the 2010 Australian Open, and won the 2008 Australian Open women's doubles title with her sister Kateryna, beating Victoria Azarenka and Shahar Pe'er in the finals. She also formerly paired with her older sister Valeria in doubles. Tennis career Early years Bondarenko started competing in the pro tour in 1999 at the age of 14. Then she competed in ITF Women's Circuit, where she reached two second rounds in Tallinn, Estonia, and Kharkiv, Ukraine. She began the year 2000 reaching her first ITF final in Kalamata, Greece but ended up losing to Ekaterina Kozhokina 5–7, 5–7, even though not losing a set before the finals. She was only able to attain good success in two events, a semifinal in Kedzierzyn-Kozle and a quarterfinal in Sopot entering as a qualifier. The rest of the year she was failing to qualify in other events. In 2001, she failed to qualify in her first three events in Dubai, Caserta and Tallinn. However, she was able two reached two semifinals, in Kedzierzyn-Kozle and Tbilisi. She also managed to reach the quarterfinals in Batumi. 2002 was an inconsistent year, as she managed to reach the semifinals in Buchan before losing to Syna Schmidle in three sets and then followed it up by falling in the qualifying draw in Dubai. The following week, she reached the second round of Dinan after getting pass the qualifying draw and followed it up by once again failing to qualify. At her next event in Fontanafredda, she qualified for the main draw again, and won her first ITF title (final against Mara Santangelo). However, in her next six tournaments she was managing only to reach one second round. After her third final in Batumi, she made first-round exits in Joué-lès-Tours and Saint Raphael, both in France. She ended the year with a semifinal appearance in Poitiers, losing to Seda Noorlander, 2–6, 1–6. In 2003, Bondarenko tried to qualify for main draws on the tour, but failed in Hobart, Melbourne, and Hyderabad. She then made it through her first WTA Tour main draw as a direct entry at the Copa Colsanitas,