As the saying goes, two out of three ain't bad.
The "two" here refers to the NBA and the NHL. The NBA's success within their Orlando bubble has been highly publicized and may even be the format of the league for the 2020-21 season (see video above), and the NHL reported similarly encouraging news on Monday afternoon.
The other phases of the NHL's Return to Play protocol involved self-isolation (Phase 1), voluntary on- and off-ice training (Phase 2) and formal training camps (Phase 3). The movement into the hub cities and return to play represented the end of Phase 3 and start of Phase 4, and, as the test results indicate, the process has been a resounding success. For more details and dates regarding the Return to Play plan, check out our summary here.
Like the NHL, the NBA reported two consecutive rounds of coronavirus testing where zero of the 344 tests came back positive (via Shams Charania).
Unfortunately, the "two out of three ain't bad" expression indicates that one is bad. Major League Baseball has dealt with a pair of coronavirus outbreaks within a team, as both the Marlins and the Cardinals experienced multiple positive tests and had to temporarily but their seasons -- as well as those of their opponents -- on hold. There have been murmurs that the season will not be able to go on like this, but commissioner Rob Manfred was adamant in telling ESPN that "there is no reason to quit now."
But MLB's problems are a different story. As for the bubble used by the NBA and the hub used by the NHL, the returns to game action have gone well and we have to admire the efforts from the league's executives in coming up with a plan, and the players and coaches for following through with the rules.