Fans with seats in the $12 upper bleacher section for high-demand games will receive only digital tickets. They will be required to swipe the credit card used to purchase them at the gate.

Fenway Park is the oldest ballpark in baseball, and it is also among the most expensive. The Red Sox say they've left the upper bleacher seats below market price to help families get into the ballpark. But that also makes it a lucrative option for the resale market.

The rules apply for 30 games this season, including the home opener, series against the New York Yankees and interleague play against the Atlanta Braves.