When you're the world number 772 and you're taking on the greatest tennis player the world's ever seen, you need all the help you can get.
And what Marcus Willis' fans are doing to show their support as he takes on Roger Federer is taking off their shoes.
-- Cara Robinson (@CaraRobbo) June 29, 2016
-- Christopher Wood (@ChrisJW1987) June 29, 2016
-- Liz Henwood (@Pipsissiwa) June 29, 2016
-- Louise Latter (@LouiseLatter) June 29, 2016
-- Louise walker (@LarisWalker) June 29, 2016
Now, exactly what taking off your shoes does to help the underdog out isn't entirely clear - apparently it's inspired by one of the Brit's favourite pranks.
But what is clear is that if you're not doing it, you can't call yourself a fan.
Shoes off for #MarcusWillis
-- Harriet (@xharrietx1991) June 29, 2016
-- Trish Tan (@trish_tan) June 29, 2016
And if you're not one for showing your feet to the world, but you still want to get involved, you can always join in with the chant.
You know the one...
He didn't play a minute at the Euros, but Will Grigg's song is being sung on Centre Court... "Willbomb's on fire, Federer is terrified"
I can't get "Willbomb's on fire, Federer is terrified" out of my mind.
Willbomb-mania is truly in full swing.