NASHVILLE, Tenn. (AP) — Defending champions Alexa Knierim and Brandon Frazier withdrew from the U.S. Figure Skating Championships on Wednesday night when he tested positive for COVID-19.
The pairs event begins Thursday at what amounts to the U.S. trials for the Beijing Olympic team. Knierim and Frazier, who became a duo last season when her husband, Chris, retired from skating still could be select…