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The Boston Red Sox-New York Yankees rivalry is alive and well.

During Boston's Saturday night 2-1 win over New York, Mike Napoli was batting against Masahiro Tanaka with two strikes and two outs in the top of the ninth inning and the score tied at 1-1.

Tanaka grooved a fastball over the plate, and Napoli deposited the pitch into the right-field bleachers for a go-ahead solo home run.

The real action comes at the 30-second mark of the video below. As Napoli heads into the dugout, he says "what an idiot" as he refers to Tanaka giving him a pitch to hit when ahead in the count 1-2.

Napoli addressed the insult after the game, via John Harper of the New York Daily News:

While it's refreshing to hear an athlete own up to what was said on the field of play, it's hard to believe Napoli when he says the "idiot" comment was "nothing towards him."

It will be interesting to see what happens next time Napoli steps into the box against Tanaka, that is for sure.

[MLB, h/t: HardballTalk]