... is that she actively shills for Tempur-Pedic mattresses.

But seriously, the GOAT in women's tennis says that she "feels that she's been there [at Wimbledon] in a weird way," supporting sister Venus Williams. There's a genuinely weird way about her showing on ESPN's SportsCenter The Six program.

The topic of her sister Venus' play on the All England Club's grass came up, as only it could, as did Serena's own regimen of continuing to hit on a tennis court for about 20 minutes weekly. Then, this:

"I don't think there's a woman player, and there really shouldn't be a female athlete, that is not totally supportive of Andy Murray," Serena states, in addressing the Brit's response to a reporter's question, in perhaps her most thoughtful answer in the ESPN segment.

"He has spoken up for women's issues and women's rights, especially in tennis, for forever. And does it again," Serena adds. "That's who he is, and that's one thing that we love about him. He has such a wonderful mother who has been such a strong figure in his life, and he's done so much for us on our tour, and we love Andy Murray."

Elsewhere over nearly seven fairly long minutes, Williams waxes philosophical over hand sanitizer and other pre-childbirth rules she might put in play and more–all under the watchful, ahem, gaze of her sponsors.

Serena won't dish on her baby's gender or ideas for names yet, if indeed she has the info on both, but she did recently share with People magazine what childhood ritual from her days going to sleep beside Venus and their other sisters she hopes to pass on to her progeny. 

Based on what we saw at the ESPY Awards this week, dare I say that Williams is rapidly turning into the Peyton Manning of women's sports. There's hardly an endorsement she's not given to aligning with, and this has been the case for some time. There is nothing new under the sun. 

Follow Jon on Twitter: @jonscott9.