Happy Birthday, Serena Williams!

Happy Birthday, Serena Williams!.

Serena Jameka Williams turns 42 years old today.

Here are five fun facts about the tennis superstar.

1.

She has been playing tennis since she was just 3 years old.

2.

Aside from tennis, her favorite sport to watch is gymnastics.

3.

The "Serena Slam" tennis term is used when someone wins all four Grand Slams in a row.

4.

Williams has served over 120 mph.

5.

She has won 23 Grand Slams. Happy Birthday, Serena Williams!