NBA free agency is set to open on Monday, as players and teams can agree to deals starting at 6 p.m. A few major names have already re-signed with their incumbent teams — most notably LeBron James opting into the final year of his contract for the first time in his career — before the floodgates open.

The Boston Celtics are preparing for a potentially difficult free agency period. Al Horford and Luke Kornet are both unrestricted free agents heading into June 30, and could possibly sign elsewhere. Both big men have been key to Joe Mazzulla's rotation,