The Vallejo Admirals entered the season as defending champions, having defeated the Sonoma Stompers 11–8 in the league's 2017 championship game.
[4][5] The top four teams would qualify for the 2018 playoffs with two best of one series to determine the champion.
as of August 31, 2018 [6] To qualify as league leader for hitter, AVG - Minimum of plate appearances of 2.7 per team game.
To qualify as league leader for pitcher, ERA - Minimum inning(s) of .8 pitched per team game.
The lowest seeded team would then host a best-of-one championship game.