"I've been playing for 21 years, since the day my son was born until today so it is a happy day," said Davies. "I don't know what is going on with me lately. It keeps going to the fifth set.
"All the psychology work I've done and all that experience came together great on the day. It was a big scrap out there and I am not saying it was easy because it wasn't. Lee from Korea is a great player and big respect to him."
The Welshman became involved in the sport five years after he was paralysed in a motorbike accident.