Mouratoglou said Williams' post-maternity return was probably "the biggest challenge" of her career.
"When I was younger, sport gave me objective and kept me motivated", said Williams.
Zarina Diyas enters this match 3-3 on the main tour and would love nothing more than to get a big victory to kind of get her season going. "It takes a lot of work and I'm going to keep on going and working at it, and I encourage others to use their voice and their platforms to do that same".
Serena won her first match against Marion Bartoli of France, the former Wimbledon champion who is ending a 4 1/2-year retirement, but lost 13-11 to Zhang in the semifinals.
Her sister Venus, who was also at the event in NY, said: 'I mean, the matches are definitely a good way to know where you are, but obviously she knows how to play.
The 36-year-old, who gave birth to her daughter in September, is one of the greatest to have played the game and her 23 major titles is a record for a female player in the Open Era. And also by giving her daughter a meaningful chance to watch her play.
"Serena's target will be to win grand slams". We all know what Serena is capable of when in good form, but the time away from the sport and the fact she's now approaching 37 years old makes you wonder just how effective she can be at this point.
She continued: 'I'm ready or I wouldn't be playing. She wants to share there is no wrong way to be a woman. She is upbeat that she will be up her feet to roar once again at the Grand Slam.
"It would be so [much] fun - the help that we could do, and the awareness and the athletes and the fantastic players that would come out of Africa would just be unbelievable", she added.
"I would have thought I would have retired six years ago, but I'm still here and I'm playing great, and I think I'll still be playing good". He said he sees the same determination in practice, but wouldn't know if being a mother had changed her until he saw her competing. I can't go and say, "I expect to lose", because that's just something I'll never say.