The A's and Mariners don't meet in the regular season until April 20, but that didn't stop the division rivals from engaging in a competition on Wednesday.
It started just after 11am when the Mariners tweeted out a video promoting the days that ace Felix Hernandez will pitch. Within the clip, a man presents a ring to his wife and says "Happy Felix Day." The ring has baseball stitches etched in it.
It took just two minutes for the A's to respond.
"Congratulations on inventing a day so that you could finally get a ring," the A's wrote to the Mariners.