Duerr, 21, beat Slovakia’s Veronika Velez Zuzulova over two runs for her first World Cup victory. Shiffrin, 17, edged out Wendy Holdener of Switzerland in the third-place race.
The Moscow event was held on a ramp in the north of the city with two skiers going head-to-head in races that lasted around 20 seconds.
Competing in her first full season on the World Cup circuit, Shiffrin has already won three events. She extended her advantage in the slalom standings to 33 points over overall leader Tina Maze of Slovenia, who finished fifth.
Hirscher, 23, increased his lead in the overall standings to 214 points over Norway’s Aksel Lund Svindal, and also extended his slalom lead to 184 points over Felix Neureuther of Germany.
Four-time overall World Cup champion Lindsey Vonn, former Olympic champion Julia Mancuso and giant slalom World Cup leader Ted Ligety, all from the U.S., didn’t race in Moscow in order to prepare for next week’s ski world championships in Schladming, Austria.
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