the nhl and its players association have been discussing the matter. most major american sports leagues, including the nhl, are seeing more players and team staff testing positive each day. as cnn's brian todd reports, the coronavirus is proving to be the toughest opponent yet. >> it's the raiders and the browns. >> reporter: tonight the world's most popular sports leagues are flailing, struggling to figure out when they can hold contests and if their schedules can even survive the winter and the omicron outbreak. >> it is moving fast. it's moving fast in the world, and it's moving fast in sports. and while there is a bit of a playbook now for how the leagues have dealt with it, different than in march 2020, omicron is proving to move through these locker rooms and these teams at a much higher rate of speed. >> reporter: the national hockey league has just paused its entire schedule for a few days until just after christmas, after covid outbreaks affected several teams.