Career
Her highest Women's Tennis Association singles ranking is 172, which she reached on February 22, 2010. Her career high in doubles is 279, which she reached on November 9, 2009. On 12 May 2010, it was announced by the International Tennis Federation that Antoniychuk had committed a doping offence, and was suspended from participation in Women's Tennis Association and International Tennis Federation events until 21 April 2011 after her sample was found to contain the diuretic furosemide.