In the heartfelt post, Ms Williams thanks her mother for being fiercely protective and admits she worries whether or not she'll be able to handle similar criticism of her own daughter.
"I was looking at my daughter (OMG, yes, I have a daughter) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day," the tennis champion writes.
"I've been called man because I appeared outwardly strong... It has been said I don't belong in Women's sports - that I belong in Men's - because I look stronger than many other women do. (No, I just work hard and I was born with this badass body and proud of it)," she continues.
"But mom, I'm not sure how you did not go off on every single reporter, person, announcer and quite frankly, hater, who was too ignorant to understand the power of a black woman," Ms Williams writes candidly.
Read Serena Williams' letter to her mother in its entirety below:
Ms Williams welcomed Alexis Olympia Ohanian Jr, her daughter with Reddit co-founder Alexis Ohanian, on September 1. She shared the first photo of the adorable little girl on Instagram last week and posted a video of her pregnancy journey on YouTube. Barely a few weeks old, the little cutie already has her own Instagram account. Click for more trending news