Giancarlo Stanton had a MONSTER Yankees debut -- SMASHING 2 home runs -- and TMZ Sports talked to NYY's legendary radio announcer, John Sterling ... about his polarizing Stanton HR call.
Sterling -- who's announced every Yankees game since 1989 (almost 5,000 in a row) -- is known for his over the top home run calls. Ones like ...
"An A-Bomb! From A-Rod!" (Alex Rodriguez)
"He's Judge and jury, and this is judgement day!" (Aaron Judge)
So, when the ball left Stanton's bat ... and John belted out "Giancarlo, non si può stoparlo!