Momentum swung Draper's way after a peculiar moment at the change of ends following the ninth game of the first set.

With a few spots of rain falling onto the court, Fritz packed his racquet into his bag and sat waiting, while Draper was ready to play.

After a short delay, Fritz was told by the umpire to get back on court - and looked completely out of sorts when he returned.

Draper remained locked in as Fritz, who had held his first five service games without too much pressure, unravelled.

With the accuracy and pace of his first serve providing a rock-solid base, the Briton was able to use his forehand to punishing effect and quickly raced ahead before clinching a standout victory.

Now he has the opportunity unlock another new career achievement by beating Shelton to reach the semi-finals of a Masters event for the first time.

"I still feel like I have a lot to prove, not only to myself, but in general," added Draper.

"I'm not a top 10 player until I'm there and I'm always hungry for more and want to prove my level."