American gets pre-US Open boost.
"I have no idea how I made that ball!"
Ashleigh Barty v Madison Keys in the quarters.
American puts on powerful display.
Duo to contest title.
Naomi Osaka and Madison Keys latest to advance.
What's going on today, then?
Chinese player makes history.
Naomi Osaka won the battle of power-hitting against Madison Keys to reach the US Open final.