A goal in the 56th minute by striker Bernard Parker saw off the World and European champions.
And Igesund believes Bafana Bafana, who failed to qualify for next year's World Cup in Brazil, are improving.
"We've been on track for a while. The performance was a culmination of the hard work we've put in," he said.
"The players did well and stuck to the game plan. But we should not get carried away and keep our feet on the ground because there is still a lot of work to be done, and we should continue working as hard as we have been doing.