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A night at the ballpark turned violent Wednesday at Angel Stadium ... when a Los Angeles Dodgers fan was punched and kicked in the head during an altercation in the stands -- and TMZ Sports has learned arrests have been made.

The ugly incident was caught on camera.

The video shows a man in a Dodgers jersey getting sucker punched by another guy rocking a black shirt. After falling back in his chair, a second man comes up and kicks the Dodgers fan directly in the head.

According to a spokesperson for the Anaheim Police Department, the fight "appears to have started over the stealing of a hat." However, cops did not specify who took the cap.

Either way, APD says two individuals, both in their mid-20s, were arrested. One was booked for misdemeanor assault ... while the other -- wh

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