The Scot, who won the last of his six open singles titles in 2015, was well short of his best in a 6-5, 10-2 defeat.

He was suffering from shortness of breath and pains in his chest during the match, but it still required a superb performance by Kelly.

"I came here to win, so I won't admit to being surprised to have done so, but I am surprised at the scale of the victory," the winner told edp24.co.uk.

"I've played against Tattie [Marshall] many times all over the world, and soon realised that he was not his usual self out there today."

Two English players also progressed today.

Third-seed Nick Brett beat South African qualifier George Lotter 10-5, 9-7.

Mark Royal, the 13th seed, also triumphed 12-4, 10-5 against Scott Walker of Australia.