What happened: The MLB Players Association withdrew a revenue-sharing grievance against the Tampa Bay Rays last year, per MLB Trade Rumors.

Why it matters: The collective bargaining agreement requires clubs that receive revenue-sharing money to use it to improve on-field performance, and a grievance is the union's main tool to enforce that rule. The withdrawal comes as the union pushes its own revenue-sharing plan ahead of bargaining with owners.

What to watch: Watch whether revenue-sharing enforcement becomes a sticking point once the union and owners resume negotiations on a new labor deal.