Meet mystery former NFL star behind Madison Keys' upset Australian Open triumph

[@vasantsande8644]

MK:
You have all the moves tennis needs to win.
Congratulations!

[@squidjames7735]

Thank you ... I thought I spotted him tending to Ben's pre-match work-up too.

[@thomasboardman4441]

I can't listen to these machine generated narrations.

[@ppp8734]

They're really bad.

[@superyt4ever]

Who is that Asian lady member of Keys team, then?

[@leannelockhart270]

Yes ,l like to know who the lady is as well, no mention of her

[@rosewills3354]

Physio I believe

[@carseye1219]

NFL "star"? The standards for stardom been lowered that far?