Justin Bieber tried to impress his Miami mystery date by taking her to Game 7 between the San Antonio Spurs and Miami Heat -- but based on some pics he screwed it up.
It's unclear if things are serious with this new chick -- who seems older than Selena Gomez, and is definitely WAY more endowed!
JB was spotted around Miami with her before the game ... and sitting next to each other in a luxury box during.
Here's the thing ... if Justin really wanted to impress her, he wouldn't have worn those neon sneakers.
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