As U.S. figure skaters test positive, new worries before Winter Olympics.

Mariah Bell’s victory at the U.S. national championships on Friday secured her a spot on the American Olympic team.Credit...Matthew Stockman/Getty ImagesU.S. Figure Skating on Saturday announced the women’s team heading to Beijing for the Winter Olympics next month. It will include a top-ranked competitor who withdrew from nationals this week in Nashville after a positive coronavirus test, a stark reminder of a resurgent pandemic still capable of disrupting sports events and lifelong dreams.

“Things happen unfortunately, but it is what it is,” Alysa Liu wrote on social media after her withdrawal on Friday. A strong showing this past season on the international circuit, in spite of having to…