A year to the day after COVID-19 brought the college basketball postseason to a halt, the pandemic continues to disrupt the sport, with three premier programs forced to abandon their conference tournaments because of positive coronavirus tests.

No. 16 Virginia — the most recent national champion — and No. 11 Kansas were forced out of the semifinals of their tournaments on Friday, a day after Duke also dropped out, ending a disappointing season for coach Mike Krzyzewski's storied program.

There's no guarantee that Kansas or Virginia will be back for the NCAA Tournament, potentially depriving th...