Julia Olehivna Vakulenko (Ukrainian: Юлія Оле́гівна Вакуленко; born 10 July 1983) is a Ukraine-born former tennis player. She achieved her career-high ranking of No. 32 in November 2007.

In April 2008, Vakulenko renounced her Ukrainian citizenship, and then announced her decision to acquire the citizenship of Spain where she's lived for the last ten years.^[1][2]

At the 2006 French Open, Vakulenko reached the third round. At the 2006 Wimbledon Championships, she withdrew during the first round due to injury.

Julia became Kim Clijsters' last opponent in her professional career (before Clijsters' return in 2009). Vakulenko won 7–6⁽³⁾, 6–3 in the second round of J&S Cup in Warsaw, Poland on 3 May 2007. This earned her the nickname "Kimmie Killer".

A week later, Julia defeated world No. 3, Amélie Mauresmo, at the German Open in Berlin, 2–6, 6–1, 6–2 (her career best), and then defeated Dinara Safina, 6–3, 5–7, 6–3, before retiring in the first set in the semifinals to eventual champion Ana Ivanovic due to an injury.

On 28 August 2007, in the first round of the US Open, Julia defeated ninth seed Daniela Hantuchová, 6–4, 3–6, 6–1. She eventually reached the fourth round, her best performance at a major, before falling to Ágnes Szávay.

At the final event of the season, the Bell Challenge held in Quebec City, Vakulenko reached the first WTA Tour final of her career. En route, she beat Rossana de los Ríos, home favourite Stéphanie Dubois, Olga Govortsova and Julie Ditty. In the final, she lost 4–6, 1–6 to three-time Grand Slam champion Lindsay Davenport, who was playing in only her third event since giving birth.

After changing of her citizenship from Ukraine to Spain in April 2008, she planned to play for Spain in the Fed Cup, but wasn't able to compete in the 2008 Olympics due to lack of time to be included in Spain's application.^[1]

Result	Date	Tournament	Tier	Surface	Opponent	Score
Loss	Nov 2007	Bell Challenge, Canada	Tier III	Carpet (i)	Lindsay Davenport	4–6, 1–6

Result	No.	Date	Location	Surface	Opponent	Score
Loss	1.	28 September 1998	Lerida, Spain	Clay	Mariam Ramón Climent	1–6, 3–6
Win	2.	6 December 1998	Mallorca, Spain	Clay	Laura Pena	6–4, 6–1
Loss	3.	3 April 2000	Dinan, France	Clay	Melanie Schnell	6–2, 1–6, 2–6
Loss	4.	18 June 2000	Lenzerheide, Switzerland	Clay	Kira Nagy	2–6, 6–3, 6–7
Loss	5.	10 July 2000	Getxo, Spain	Clay	María José Martínez Sánchez	4–6, 0–6
Loss	6.	5 August 2001	Saint-Gaudens, France	Clay	Céline Beigbeder	4–6, 1–6
Win	7.	17 November 2002	Deauville, France	Clay (i)	Virginie Pichet	6–2, 6–1
Win	8.	3 December 2002	Daytona Beach, United States	Hard	Bethanie Mattek-Sands	6–4, 6–0
Win	9.	29 September 2003	Girona, Spain	Clay	Barbora Strýcová	7–5, 2–0 ret.
Win	10.	8 February 2009	Rancho Mirage, United States	Hard	Lauren Albanese	6–0, 6–1
Loss	11.	16 February 2009	Surprise, United States	Hard	Yanina Wickmayer	7–6(0), 3–6, 3–4 ret.
Win	12.	27 June 2009	Périgueux, France	Clay	Sophie Ferguson	6–2, 7–5
Win	13.	10 August 2009	Koksijde, Belgium	Clay	Iryna Brémond	7–5, 6–1

Result	Date	Location	Surface	Partner	Opponents	Score
Loss	23 November 2003	Barcelona, Spain	Clay	Núria Roig	Marta Fraga Adriana González-Peñas	3–6, 3–6

• ¹ Doha became a Tier I tournament in 2008, replacing San Diego and Zürich

Players who have been ranked world No. 1 are in boldface.

#	Player	Rank	Event	Surface	Round	Score	JVR
2007
1.	Kim Clijsters	No. 4	Warsaw Open	Clay	2nd round	7–6(7–3), 6–3	No. 61
2.	Amélie Mauresmo	No. 3	German Open	Clay	3rd round	2–6, 6–1, 6–2	No. 53
3.	Dinara Safina	No. 10	German Open	Clay	Quarterfinals	6–3, 5–7, 6–3	No. 53

• Julia Vakulenko at the Women's Tennis Association
• Julia Vakulenko at the International Tennis Federation