Chase Field witnessed a moment that has been seen before — and not a good one. For the fourth straight MLB season, an Arizona Diamondbacks fan fouled a live ball, forcing an umpire review and infuriating the team and its fans. This time, the incident didn’t end with a warning. It ended with a season-long ban.
During the Diamondbacks’ July 1 game against the San Francisco Giants, Christian Koss hit a fly ball deep into left-center field. A fan leaned over the railing and caught it — costing the outfielder a potential play. It was initially ruled a home run, but after a review, the call was overturned to a double. Arizona won 4–2, but the moment sparked immediate backlash.
“We’ve seen this before. Every season. Every time, it’s the same guy,” one frustrated fan said on X (formerly Twitter).
That “same guy” turned out to be longtime season ticket holder Dave McCaskill, who has now been involved in four consecutive season-long interference calls.
The Diamondbacks responded: “Enough is enough.”
In an official statement, the team took decisive action:
“This particular fan has engaged in multiple acts of criminal conduct at Chase Field. As a result, we have terminated his Advantage membership and he is prohibited from returning to the ballpark for the remainder of the 2025 season.”
This is the first time the franchise has issued such a penalty for repeated fan interference.
‘I Didn’t Mean It’: Fan’s Defense
McCaskill later spoke to Arizona Sports’ Bickley & Marotta, where he acknowledged the situation but insisted he wasn’t trying to interfere.
“Two of them were very close to the boundary,” he said. “I apologize to the D‑backs. I apologize to the D‑backs fans. I would never interfere.”
But fans — and league officials — weren’t buying it. Footage clearly showed him reaching over the outfield wall before the ball crossed the boundary.
Fan interference has long been a contentious issue in Major League Baseball — from Steve Bartman in 2003 to recent high-profile cases. But what makes this case unique is its repetition and fans’ awareness of its history.
MLB insiders say the league is closely monitoring the case, especially given its impact on live games and the need to review lengthy replays.
As the Diamondbacks continue their push to make the playoffs, they will do so without one of their most recognizable — and problematic — fans in the stands. McCaskill could be eligible to return in 2026, but only with stricter expectations of behavior.
“We’re here to protect the integrity of the game,” said one team executive. “And that means holding everyone — even the fans — accountable.”