|Full name||Renata Šašak-Ružir|
|Born||14 June 1964|
Zagreb, SR Croatia, Yugoslavia
|Career titles||1 ITF|
|Grand Slam Singles results|
|French Open||2R (1983)|
|US Open||1R (1983)|
|Career titles||6 ITF|
|Grand Slam Doubles results|
|French Open||2R (1984)|
Renata Šašak-Ružir (born 14 June 1964) is a Croatian former professional tennis player.
Born in Zagreb, Šašak debuted for the Yugoslavia Federation Cup team in 1979. One of her Federation Cup doubles teammates was Mima Jaušovec, who Šašak teamed up with to win a gold medal at the 1979 Mediterranean Games. She won a further gold medal four years in Casablanca at the 1983 Mediterranean Games, beating Laura Golarsa to win the women's singles.
Šašak competed in the main draw of both the French Open and US Open during her career. Her best performance came at the 1983 French Open, where she made it to the second round, then took fifth seed Pam Shriver to a third set before being eliminated. She was awarded the Croatian Sportswoman of the Year award from Sportske novosti in 1983.
At the 1984 Summer Olympics in Los Angeles, Šašak represented Yugoslavia in the women's singles event, for what was then a demonstration sport. She fell in the second round, after beating third seed Laura Arraya.
Šašak played Federation Cup tennis until 1987, in a total of 15 ties. This included Yugoslavia's run to the 1984 semi-finals, which they lost to eventual champions Czechoslovakia.
|Runner-up||1.||19 April 1981||Taranto, Italy||Clay||Michaela Pazderová||4–6, 2–6|
|Runner-up||2.||31 May 1981||Rheda-Wiedenbrück, West Germany||Clay||Lea Plchová||1–6 ret.|
|Runner-up||3.||19 September 1981||Landshut, West Germany||Clay||Helga Lutten||1–6, 4–6|
|Runner-up||4.||11 April 1982||Taranto, Italy||Clay||Lea Plchová||1–6, 2–6|
|Runner-up||5.||12 September 1982||Bad Hersfeld, West Germany||Clay||Petra Huber||2–6, 1–6|
|Runner-up||6.||20 August 1984||Rheda, West Germany||Clay||Isabelle Demongeot||6–7, 5–7|
|Winner||7.||10 September 1984||Darmstadt, West Germany||Clay||Andrea Meier||6–3, 6–1|
|Runner-up||8.||13 October 1986||Rabac, Yugoslavia||Clay||Linda Ferrando||2–6, 3–6|
|Winner||1.||5 July 1981||Travemünde, West Germany||Clay||Lea Plchová|| Iris Riedel-Kühn
|6–4, 5–7, 6–3|
|Winner||2.||11 April 1982||Taranto, Italy||Clay||Manuela Maleeva|| Catrin Jexell
|7–5, 3–6, 6–2|
|Winner||3.||18 April 1982||Lecce, Italy||Clay||Manuela Maleeva|| Lena Sandin
|6–2, 2–6, 8–6|
|Winner||4.||12 September 1982||Bad Hersfeld, West Germany||Clay||Isabelle Villaverde|| Natasha Piskachova
|Runner-up||5.||28 March 1983||Taranto, Italy||Clay||Sabrina Goleš|| Elizabeth Minter
|Runner-up||6.||18 April 1983||Bari, Italy||Clay||Sabrina Goleš|| Elizabeth Minter
|Winner||7.||9 April 1984||Caserta, Italy||Clay||Larisa Neiland|| Marie Pinterova
|Winner||8.||27 August 1984||Bad Hersfeld, West Germany||Clay||Isabelle Villaverde|| Vicki Marler
|Runner-up||9.||8 October 1984||Sofia, Bulgaria||Clay||Regina Maršíková|| Alice Noháčová
|Runner-up||10.||8 September 1986||Zagreb, Yugoslavia||Clay||Karmen Škulj|| Natalia Egorova