ST MORITZ, Switzerland (Reuters) -American Mikaela Shiffrin claimed a record-extending 91st alpine skiing World Cup victory when she won the downhill at St. Moritz on Saturday. The twice Olympic gold medallist recorded a two-run time of one minute 28.84 seconds for her fourth career World Cup downhill win and first at the Swiss resort, putting her hand over her mouth in surprise when she slowed to a stop. Shiffrin edged Italy's Sofia Goggia, who finished 0.15 behind after a ski buckled briefly near the end of her second run.