Williams reveals child birth complications: 'I am lucky to have survived'

Williams said she had a pulmonary embolism which she is a problem she has history with and as a result, she had to have surgery and stay at home for six weeks after the birth.

This in itself makes her comeback to the top of the sport even more remarkable and shows the real fight of the legendary American.

"It began with a pulmonary embolism, which is a condition in which one or more arteries in the lungs becomes blocked by a blood clot.

Because of my medical history with this problem, I live in fear of this situation. So, when I fell short of breath, I didn’t wait for a second to alert the nurses. This sparked a slew of health complications that I am lucky to have survived.

First, my C-section wound popped open due to the intense coughing I endured as a result of the embolism. I returned to surgery, where the doctors found a large hematoma, a swelling of clotted blood, in my abdomen. And then I returned to the operating room for a procedure that prevents clots from traveling to my lungs.

When I finally made it home to my family, I had to spend the first six weeks of motherhood in bed."