Fresh off his arrest for battery in Florida ... WWE's Ludwig Kaiser was back in the wrestling world, but in a totally different role in Mexico and the crowd there just loved it!

Kaiser (real name: Marcel Barthel) turned into his alter ego -- the mask-wearing El Grande Americano -- for the cheering crowd Friday night at his very own "Serenade for El Grande Americano" rally in Mexico City.

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Video shows El Grande getting pumped up and emotional, appearing to wipe tears from his eye slits as he high-fives fans.

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Another clip shows the wrestler looking dapper in his suit behind the scenes ahead of his upcoming mask vs mask match at Noche de Los Grandes next Saturday.   

El Grande's rally was supposed to go down earlier this week ... but it got moved to Friday after his arrest Wednesday for battery in Orlando, Florida.

As we first reported ... Kaiser allegedly slugged his neighbor and pushed him to the floor during an argument inside their apartment building. Police say the neighbor called out Kaiser for allegedly making out with his girlfriend aggressively, sparking the confrontation.