Hurricane Gustav, which was upgraded to a potentially catastrophic Category 4 designation this afternoon, prompted the Mets’ Triple-A affiliate in New Orleans to cancel the final three games of their season. The final contest for the Zephyrs was supposed to be played this morning, but that also was scrubbed. The cancellations likely mean the end of the Zephyrs’ relationship with the Mets, who reportedly are planning a switch to Syracuse next season.