LOS ANGELES — Serena Williams has just come back from tennis practice and collapses into a chair at her home in Beverly Hills. The only visible hints of her status as a tennis legend are the gold, racket-shaped earrings dangling discreetly from her ears.
“I’m exhausted. I’m going on, like, three hours of sleep in five days,” Williams says. “The baby got sick last night travelling.”
Serena Williams…