New York: "Meet Alexis Olympia Ohanian Jr," this is how Serena Williams introduced her newborn daughter Alexis to her fans.

Proud mom Serena Williams introduced her daughter Alexis Olympia Ohanian Jr. on Instagram, almost two weeks after her birth.

She wrote, "Meet Alexis Olympia Ohanian Jr," along with a precious snap of the mother and daughter together, the first photo to have been shared of the little lady.

The athlete and her tech beau, Alexis Ohanian, named their first child together after the Reddit co-founder.

But what made it even better for the fans was that Williams documented her entire pregnancy journey and shared the touching video diary online on Wednesday.

In a two-minute clip, the star pair shared snippets of the most special moments in their pregnancy, including the first ultrasound, photos of Serena's baby bump at different stages, Alexis building the crib and the baby's ultimate arrival.

The tennis champion also touched upon a more serious note of her pregnancy when she revealed there had been "a lot of complications", but they left the office with a bundle of joy joining their family.

The couple welcomed their daughter on Friday, September 1 at St. Mary's Medical Center in West Palm Beach, Florida.