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For those hoping Roger Federer would have a change of heart about his retirement decision ... the 20-time Grand Slam champion tells TMZ Sports it's time to give up hope -- 'cause he's adamant he's really done playing for good.
We caught up with the 42-year-old tennis great out in NYC this week ... and despite hanging up the racket back in 2022, there were still a ton of fans waiting outside to greet him.
Federer spoke with our cameras for a bit as he signed autographs .