Madison Keys has the serve of a polished veteran, has achieved things in tennis many of her older contemporaries will never match, and turned pro all the way back in 2009. She's been on the tour for eight years—more than a third of her entire life.

Serena Williams owns the greatest serve in women's tennis history, has won more Grand Slam singles titles than anyone in the Open era, and turned pro in 1995—she's been on tour for more than half of her life.

So you can understand Williams' reaction on Snapchat after hearing Keys say, "I am a veteran now" on Tennis Channel:

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Before she took leave from the game for her pregnancy, Williams was playing with the savvy of a veteran, but with the urgency and potency of a young, rising star. Keys, whose tournament win in Stanford helped put an injury-affected start to the season behind her, has shown similar qualities this summer. She remains one of the game's young, rising stars, even though it feels like she's been around forever.

Sort of like a veteran—right, Serena?

Madison—a veteran?
No, no, no snaps
Serena Williams

Madison—a veteran? No, no, no snaps Serena Williams

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