Ace

where the tennis ball lands into the service box and is not touched by the receiver.

That ace from Roger Federer was astonishing. Novak Djokovic couldn't return it.

Mob

A large crowd of people, especially one that is disorderly and intent on causing trouble or violence, usually protestors.

He was mobbed by autograph hunters.

boi

Someone says this when someone says something or does something really stupid.
Usually, you put your hand out and point it to the person.

John: Your back is deformed.

Tony: Your face is deformed
John: boi (sticking hand out, toward him.

Novak Djokovic

A Serbian tennis player. A former world No . 1, the GOAT

That forehand winner was astonishing from Novak Djokovic.

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Breakpoint

When a server loses a game her opponent has “broken” her serve. So anytime you're one point away from winning a game while your opponent serves, you have a break point. A break point occurs when the game score is 0-40, 15-40, 30-40 or when the returner has the advantage in a deuce game.

Novak Djokovic had a breakpoint in the first game against Roger Federer.

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