Thought that was weird too. Had to do some Rookie ball research due to the curiosity. Looks like it was slightly off, as they play three other teams. Probably missed that the GCL Cardinals and GCL Marlins are both "Jupiter" and share a park. It's a 16 team league with four divisions. It looks like two of the divisions are close to Tampa and play each other, but the "East" or "South" divisions don't, so their ~64 game schedule is against three other teams. The Northeast and Northwest divisions both have Yankees affiliates who play each other...got to love getting drafted and assigned to the "GCL Yankees 1" or "GCL Yankees 2". Can certainly see how getting sent to the GCL can be rough. By contrast, our Arizona League Brewers are in a 13-team league and four team division, but play inter-division against the rest of the league, so the schedule at least has some variation to it. Helena (Pioneer League) plays in an eight team, two division league that plays all other teams.