(Photos courtesy https://twitter.com/ATPWorldTour)
This is a huge upset with Millman winning 3-6, 7-6, 7-5, 7-6.
Millman now advances to his first ever grand slam quarterfinal - against world number 6 Novak Djokovic. Good luck John!
A brief tune to celebrate - from a delighted Ludwig van - especially good 2 minutes in:
And also footage of Millman after the win, taking applause from crowd.