[ESPNCRICINFO] – Saim Ayub’s dream debut season soared to new heights as a magnificent hundred from the Pakistan opener helped seal a thrilling win in the first ODI over South Africa in Paarl. Taking charge of a game that looked a lost cause when Pakistan lost four early in a chase of 240, he struck up a 141-run partnership with Salman Agha, whose all-round contribution began with a four-wicket haul and culminated in an unbeaten 82 as he held his nerve in a tense late stand with Naseem Shah to get Pakistan over the line with three balls and as many wickets to spare.

All of this appeared a world away when Pakistan stumbled badly in pursuit of what should have been a below-par first-innings effort from South Africa. Marco Jansen cleaned up Abdullah Shafique with a pearler first up, swinging it back in to brush off stump. Babar Azam muddled through for a turgid 23 that does little to allay concerns over his own form, with Ottneil Baartman – who began with two maiden overs, drawing him into a miscue that went straight to the cover fielder. It was swiftly followed by captain Mohammad Rizwan being cleaned up off the pads, and a flustered Pakistan were in a generous enough mood to gift South Africa another wicket when Kamran Ghulam set off for a run Ayub had no interest in.

Pakistan’s long tail continues to be a problem, and Irfan Khan’s teething problem continues, so when the visitors found themselves at 60 for 4 in the 20th over, the Ayub-Agha partnership was their last realistic shot at an unlikely victory. South Africa had the chance to slam the door in Pakistan’s face, but when Agha nicked off to Aiden Markram on 6, Heinrich Klaasen shelled a sharp chance.

Gradually, imperceptibly at first, Pakistan began to claw their way back into the game. Ayub, who had until then scrapped uncharacteristically to 31 off 57 at one stage, began to find regular singles and doubles, as well as the occasional boundary. Agha is perhaps ideally suited for that kind of role, possessing the wile to squeeze out runs even if the power hitting doesn’t come naturally to him.

As South Africa’s intensity and quality in the field dropped, the partnership steadily built, sneaking past 50, and eventually striding past three figures. Ayub, who had by now worked his way into the sort of flair that he’s naturally known for, turned the screw against Baartman, whose figures until then read 5-2-9-2. Two sixes and two fours brought the asking rate back down under a run a ball before Ayub slapped Rabada for a majestic six over midwicket to bring up his second ODI hundred in three innings.

But with a long tail, there was the inevitable risk. Ayub had been playing with fire helping it to the deep-third and fine-leg boundaries, and eventually ended up holing out to the latter. Kagiso Rabada, sensing his opportunity, prised out Irfan four deliveries later, and South Africa were into Pakistan’s tail.