I ran several Free Matches during the ARKs League without going into Main Matches until today. I just ran two and the Character Info page is still showing a Main Match boost. Did the game save all of the boosts I earned? I thought I would need a Free Match to refresh the boost.

One Free Match will give you two runs of Main Match Boost, and you can have up to four runs worth of Main Match Boost stocked up (ie. 2 Free Matches will give you 4 Main Matches with the boost).

@AndrlCh Thanks, I didn't remember seeing any thing about that boost. I only just learned it was valid for two Main Matches.