MIAMI -- The Mets have fired their senior vice president in charge of ticket sales, Fred Kerber reports in the Post.

The Mets officially are averaging 27,034 per game, which ranks 21st in MLB. The team averaged 26,695 a season ago, and could finish below that average this year because September figures to be a slow month.

Writes Kerber:

Fans weren’t paying at the box office so a Mets executive paid with her job.

With only the Diamondbacks and Marlins selling fewer tickets in the National League than the Mets, the team has fired Leigh Castergine, senior vice president, ticket sales and services who had been with the team since 2010.

“Leigh Castergine, Senior Vice President of Ticket Sales & Services, is no longer with the organization. Although no replacement has been named yet, we have a talented staff in place to handle all ticket related business while we embark on a national search for this role,” the team said Sunday in a statement to The Post.