Serena Williams' serve is widely considered the greatest among female tennis players and even in the conversation among the greatest serves regardless of gender.

As Mehrban Iranshad of the Tennis Files podcast says, "Serena's serve is so dominant because of a couple key attributes: power, spin, placement and unpredictability."

Here, Iranshad breaks down in details how those four things combine to make Williams' serve such a defining part of her game.

"It all starts with that proper continental grip or a slight variation of that," Iranshad says. "You see a lot of players who don't have proper grip and that really impacts the pronation, the power."

A great serve takes years of training, and it's clear that Williams' hard work on it has paid off with 23 Grand Slam singles titles, the most by any player in the Open Era and the second-most all time behind Margaret Court.

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