But his wait for a mistake from Grace proved in vain as the local player calmly parred his way to victory on Royal Johannesburg and Kensington’s East Course.

Grace, the joint overnight leader following a rain-shortened third day, ended up finishing the tournament on 17 under par, a shot clear of Elson and three in front of a group of six players on 14 under.

They were Scottish duo David Drysdale and Marc Warren, and South Africans Jaco Van Zyl, Trevor Fisher Jnr, Dawie Van der Walt and Michiel Bothma.

A victorious Grace said after claiming his maiden European Tour title on Sky Sports 3: “This is a dream come true, it’s nice to win in front of my home crowd, I wouldn’t change it for anything else.”

Grace was tied for the lead yesterday on 15 under with England’s Richard Finch when the day’s play was suspended by heavy storms.

The 23-year-old from Pretoria birdied the final two holes of his third round this morning to move to 17 under, building a three-shot lead over nearest challengers Finch and South African George Coetzee heading into the final round.

Finch had been in contention for the opening three days but he had a Sunday to forget after completing his third round with a bogey five on the 17th before then falling away badly in his final round when he shot a six-over-par 78 to finish on eight under.

In contrast Grace was a picture of consistency in his fourth round, playing out 16 holes to par, dropping a shot on the second before downing a birdie on the ninth.

That proved enough for victory as Elson, who holed a 40-foot birdie putt on the final green of the European Tour’s qualifying school at the end of last year to secure his card, could only sit and watch from the clubhouse having done he all he could to put himself in contention earlier on.

Elson’s brilliant round included six birdies on the opening nine holes to reach the turn in 31 and he added another birdie on the 16th before completing a magnificent day with an eagle three on the 18th.

That left the 30-year-old Elson, who shared the opening-day lead after starting with an eight-under-par 63 on the West Course, on 16 under but he had to settle for runners-up spot as Grace played out his final nine holes for par.

Grace said: “It was pretty tough out there today. I must say I actually played really nicely, I think I hit the ball superb, and then my putter was just cold, I couldn’t get the speed of the greens going today, but fortunately at the end of the day it was enough.”

Grace also praised his caddie, adding: “I think there was one big key today, Zack (Rasego) on the bag, kept me calm throughout the whole day so big thanks to him.”