In a match that was stretched overnight, after the contest was suspended due to rain, Sithole defeated Israel’s Itay Erenlib 6-2 6-4 and regained the title he last won in 2015.
“It was important for me to win as I got a lot of rankings points … so it was a good opportunity for me, which I grabbed with both hands,” said Sithole, who won the US Open in 2013.
The 30-year-old player, a former world No 2, said he was geared up for a whirlwind international season.
“This brings a lot of confidence because there’s still a long way to go in the season,” he said.
“I have the Japan Open, and then tours of Korea and France coming up, so winning today is going to give me that confidence going forward.”
Meanwhile, in the men’s singles final at Ellis Park, Swedish player Stefan Olsson claimed his first SA Open title, making a career breakthrough with his maiden ITF Super Series victory.
He secured a 6-4 6-2 win over Great Britain’s Gordon Reid, the Paralympic champion.
In the all-Dutch showdown for the women’s singles title, Diede de Groot emerged as another firsttime SA Open champion, defeating compatriot Marjolein Buis 6-1 6-0.
The duo then teamed up to win the women’s doubles title, beating Sabine Ellerbrock of Germany and Charlotte Famin of France 6-4 6-2 in the final.