The former grand slam champ makes his way down to the strains of Thunderstruck.

What a bop.

A singlet, sneansing in a flat cap and wig.

Iconic from the tennis legend.

And he goes in flashing the very sponsored soles of his shoes. The man's an absolute pro.

The sweatiest man in tennis didn't like ice baths when he played and the pain is still real, no matter how many Joe Rogan or Wim Hof videos you watch.

"It was never an enjoyable experience, it's still not an enjoyable experience now."