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Drake is apparently welcoming Serena Williams shade in his Instagram comment section ... as he hit the "like" button on a user saying Sexyy Red is an "upgrade" from the tennis legend.

Champagne Papi posted a series of tennis-themed shots with the "Pound Town" rapper on Monday ... with the caption reading, "I said tennis lesson she said where’s the bracelet or the necklace."

It garnered tons of comments, including an interesting one from a person who praised Sexyy Red while simultaneously dissing Serena -- a jab that Drake was quick to endorse with a like.

"Serena Williams upgrade 🔥🔥," the fan wrote. Instagram / @champagnepapi

No disrespect to Sexyy Redd, but Serena is arguably the greatest woman to ever hold a racket ... and is by far one of the most recognizabl

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