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Czech biathlon star Koukalova out of Olympics with calf injury

PRAGUE -- Two-time biathlon world champion Gabriela Koukalova has been ruled out of next month's Pyeongchang Olympics.

The Czech Biathlon Union says Koukalova won't recover in time from a calf problem that has kept her out of World Cup events so far this season.

Koukalova says "I tried my best to return" in time for the Olympics, but "unfortunately, I could not train as I had hoped. I'm very disappointed."

Koukalova is the reigning world champion and World Cup title holder in the sprint and also has two Olympic silver medals.