Elisa Brocard (Italy) after the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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From left: Heidi Weng (Norway) and Ingvild Flugstad Ostberg (Norway) during the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Foreground, from left: Jessica Diggins (United States), Ingvild Flugstad Ostberg (Norway) and Teresa Stadlober (Austria) during the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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From left: Jessica Diggins (United States), Ingvild Flugstad Ostberg (Norway) and Teresa Stadlober (Austria) during the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Anna Haag of Sweden, center, during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Ingvild Flugstad Oestberg of Norway, foreground, during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Ingvild Flugstad Oestberg of Norway, foreground, during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Jessica Diggins of the USA, foreground, during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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From right: Teresa Stadlober of Austria and Jessica Diggins of the USA during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Heidi Weng of Norway is seen here after finishing in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Jessica Diggins of the USA is seen here after finishing in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Winners in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy (from left): Krista Parmakoski (Finland), 2nd place, and Heidi Weng (Norway), 1st place.

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Heidi Weng (Norway), 1st place, winner in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Teresa Stadlober (Austria), right, winner of the 3rd place in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Alisa Zhabalova (Russia), after the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Anna Nechayevskaya (Russia) in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Heidi Weng (Norway), in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Marina Gushchina (Russia) in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Teresa Stadlober (Austria), winner of the 3rd place in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Anastasia Sedova (Russia), foreground, in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Marina Gushchina (Russia), right, in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Alisa Zhabalova (Russia) in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Yana Kirpichenko (Russia) in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Heidi Weng (Norway), finishes in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Heidi Weng (Norway), winner of the 1st place in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Heidi Weng (Norway), winner of the 1st place in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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Winners in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy (from left): Krista Parmakoski (Finland), 2nd place, Heidi Weng (Norway), 1st place, and Teresa Stadlober (Austria), 3rd place.

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Ingvild Flugstad Ostberg (Norway) after finishing in the women's classic mass start in cross-country skiing of the World Cup Tour de Ski in Val di Fiemme, Italy.

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An athelete warms up ahead of the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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From left: Yana Kirpichenko of Russia, Nadine Fahndrich of Switzerland, Rosie Brennan of the USA and Elizabeth Stephen of the USA after finishing in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Maria Gishchina of Russia, second right in the foreground, after finishing in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Natalya Nepryayeva of Russia after finishing in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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From right: Ingvild Flugstad Oestberg of Norway, Heidi Weng of Norway, and Jessica Diggins of the USA during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Anna Nechayevskaya of Russia during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Alisa Zhabalova of Russia, front, during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Natalya Nepryayeva of Russia, right, during the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Ingvild Flugstad Oestberg of Norway after finishing in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Heidi Weng of Norway, first place winner in the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy.

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Winners of the women's 10 km mass start classic event at the World Cup Tour de Ski in Val di Fiemme, Italy. From left: Krista Parmakoski of Finland, second place; Heidi Weng of Norway, first place; Teresa Stadlober of Austria, third place.

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