Only Nintendo could come up with a system like this.
It's not just baseball that will have a trial this weekend if you need a sports fix.
Nintendo have announced the details for the online server test for Nintendo Switch Sports. As promised in the Direct, it will include tennis / bowling / swordfighting, and be available at the following times (all US ET, or UTC-4):
In order to join the test, players have to request a code from a My Nintendo page (no cost) and enter it either on the Switch or Nintendo's web-based redemption site.