"Sometimes I get really down and feel like, 'Man, I can't do this, '" she admitted. I feel like I didn't expect to play, you know, like that for me. Maybe that's why I felt like I did better. "Or I'll get angry about the crying, then sad about being angry, and then guilty, like, 'Why do I feel so sad when I have a attractive baby?' The emotions are insane".
"I didn't expect to have that much power on my serves, even though they didn't go in".
But watching from the crowd, little Alexis Olympia seemed mesmerised as mum stepped back onto court.
Serena told reporters that her path back had been full of "ups and downs" but credited her sister with helping her find her rhythm.There had been speculation she may drop out of yesterday's doubles match, against Lesley Kerkhove and Demi Schuurs, after Serena was the only U.S. player to not attend practice in the morning.
In a recent interview, Williams had revealed she was laid up for a month and a half after the birth of Alexis Olympia following a crisis caesarean segment.
Williams said: "This is literally my first time travelling with the baby and everything".
The doubles match clearly showed she was still not at her best and the resulting loss took a portion of the sparkle off the United States' generally conclusive triumph, leaving the last score 3-1 for the defending champions.
The next opportunity for Williams to add to her record-setting Grand Slam haul is the French Open at Roland Garros in late May, which she withdrew from past year due to her pregnancy.