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“By the time we got to Cooperstown, [New York], to the [National Baseball] Hall of Fame, it was almost a letdown,” Mr. Davis Jr. joked.

Robbie’s First Base has been open the past 23 years. Mr. Davis Sr. used to sell cars before switching to the sports-memorabilia business in 1989. The store is named after two people — Mr. Davis Jr. and former Orioles first baseman and Hall of Famer Eddie Murray, a friend of the Davis family.

“Eddie came and kicked off the grand opening for us,” Mr. Davis Sr. said. “From then, it just took off.”

Leftfield Pictures pitched the series to various cable networks before ABC came calling. ABC sees “Ball Boys” as a way to supplement sports coverage on Saturdays when the network doesn’t have any live game coverage.

The show’s first two episodes premiere back-to-back starting at 3 p.m. on Saturday, which leads into the regional final round of the NCAA Tournament, which airs on CBS.

The father-and-son duo aren’t sure what will happen the Monday after “Ball Boys” airs. If “Pawn Stars” is any indication, it could be a major influx of clientele. Before “Pawn Stars,” the World Famous Gold & Silver Pawn Shop had an estimated 70 to 100 patrons per day. Now as many as 1,000 people per day walk into the site of one of the most-watched reality shows in television.

“For a small business, any kind of exposure you can get is great,” Mr. Davis Jr. said.

WHAT: “Ball Boys” series premiere

WHEN: Consecutive episodes Saturday at 3 and 3:30 p.m. on ABC