Tomas Berdych sensationally upset world number one Roger Federer to set up a US Open semi-final against Andy Murray.
It was a performance of sustained brilliance from the sixth seed as he handed Federer his earliest defeat at Flushing Meadows since 2003.
Federer had never lost in 23 night-session matches at the US Open while Berdych had never played one until Wednesday night, but the conditions were certainly to his liking as he powered to a 7-6 (7/1) 6-4 3-6 6-3 victory.
The Czech said: "It couldn't be better. There is no better feeling than to play my first night session against Roger and be able to beat him.
"There is no better moments than this. I really enjoyed it. The crowd were great and I'm really looking forward to the next one."
Berdych had played very well in his run to the quarter-finals but still went into the match as a big underdog, even though he had beaten Federer in their last grand slam meeting at Wimbledon two years ago.