The Philadelphia Phillies defeated the Boston Red Sox with a rare walk-off catcher's interference, only the second such ending in MLB since 1971, helping them maintain their NL East lead.

It’s the first instance of a walk-off catcher’s interference in a major league game since Aug. 1, 1971, when the Los Angeles Dodgers won on a call against Cincinnati Reds catcher Johnny Bench.

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A walk-off catcher's interference may be rare, but for Phillies rookie Otto Kemp, Monday was the second he's seen in a year.

Michael Reaves/Getty Images It marked the first walk-off catcher's interference since 1971, according to MLB 's Sarah Langs, in a game between the Cincinnati Reds and the Los Angeles Dodgers.

It’s the first instance of a walk-off catcher’s interference in a major league game since Aug. 1, 1971, when the Los Angeles Dodgers won on a call against Cincinnati Reds catcher Johnny Bench.

It’s the first instance of a walk-off catcher’s interference in a major league game since Aug. 1, 1971, when the Los Angeles Dodgers won on a call against Cincinnati Reds catcher Johnny Bench.