"Wholesome," one Twitter user said of the viral image.
He thrashed Daniil Medvedev to claim a record-extending ninth Australian Open title on Sunday.
The tennis star was asked about her mistakes in a humbling 6-3, 6-4 defeat at the Australian Open semifinals.
The tennis star's husband wore his love as Williams advanced to meet Naomi Osaka in a blockbuster semifinal.
"Coached both 2017 Australian Open women's champions today," Patrick Mouratoglou said about the sports legend and her toddler on Twiitter.
"I don’t like him at all, so it’s fun."
"A short, sharp, circuit breaker," Daniel Andrews said.
The tennis champ wore a one-legged catsuit inspired by late athlete, Flo Jo.
The Australian Open favourite said the potential scenario would be a "crazy experience".
Jannik Sinner didn't let a gruelling first-round match against Denis Shapovalov stop him from tending to what an announcer said was a moth.