MOSCOW, December 18 (RIA Novosti) - Thieves broke into and robbed Russian tennis star Anna Chakvetadze's country house in southwest Moscow early on Tuesday, police said.

"Four unknown people wearing masks climbed over the fence of the country house at about 4:00 a.m. Moscow time [1:00 a.m. GMT], then broke into the house and tied her parents up," a police officer said.

"The robbers took away money and valuables worth some 5 million rubles (over $203,000)," the spokesman added.

Chakvetadze, 20, finished sixth in this year's Women's Tennis Association ratings, earning more than $1.4 million.

An investigation into the robbery is underway.