Here's Genie Bouchard proving two legs are a helluva lot better than one tail ... 'cause she ditched her mermaid outfit for a tiny black bikini Wednesday -- and we're all grateful for it.
The tennis superstar has been over in Necker Island for the week ... splashin' around in paradise -- mostly in barely-there bathing suits.
But, today ... Genie broke out a mermaid's tail -- and while she looked smokin' hot in it -- when she bailed on the fit ... the pool she was in definitely got a little bit hotter.
Genie's over on Richard Branson’s private island in the British Virgin Islands for a tennis pro-am ... but you'll have to excuse us for not payin' attention to the action on the court.
Seriously ... can you blame us?!?!
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