Serena Williams , 44, says her early-career hustle is the reason she can devote so much of her time to being a mom today. "I feel fortunate that I've had a career and that I don't have to do what most people do. I'm very lucky. I put in the hard work, like we all are doing, but I did it a little bit earlier. So, I think that's really working in my favor. And [now I can] just put my kids first," Williams told Net-A-Porter in an interview published on Monday. Williams began playing tennis as a