Dog Days Baseball is an absolutely fantastic fictional league. One of my favorite things about it, aside from the fictional cities, city bonuses, and long history of the league, is that the commish isn't a GM.
I'm absolutely addicted to this league and very much look forward to each sim.
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GM Havana Sugar Kings,
World Baseball League - 2000, 2003, 2005 WBL Champions
Former GM Washburn Sea Wolves
Dog Days Baseball - 1981 & 1986 Kennel Cup Champions