Arthroscopic surgery can't stop Genie Bouchard from having a super cute playdate with her NFL boyfriend, Mason Rudolph ... with the star couple hitting the beach in Miami on Friday!!

The 27-year-old tennis pro revealed she went under the knife earlier this month to fix a torn subscapularis ... and has been on the road to recovery ever since.

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Part of that rehab?? Catching some rays with her 25-year-old Pittsburgh Steelers QB boo for a bit to kick off the weekend -- but don't worry, it looks like Genie switched to a waterproof sling before hopping in the water!!