Ryan Rickelton smashed his maiden double hundred and Kyle Verreynne made an aggressive half-century as World Test Championship finalist South Africa cruised to 429-5 on Day 2 of the second and final test against Pakistan on Saturday.

South Africa has racked up 615 runs thanks to Ryan Rickelton’s career-best 259 then reduced Pakistan to 64-3 by stumps on day two of the second test at Newlands.

Ryan Rickelton's unbeaten 176 has solidified South Africa's position in the second test against Pakistan. Partnering with Temba Bavuma, Rickelton helped South Africa recover from 72-3 to 316-4 at day's end.

Rickelton finally dismissed when he attempted a tired swipe at seamer Mir Hamza and skied a catch to Mohammad Abbas at mid-on.

Ryan Rickelton moves joint-seventh in South Africa's all-time top scorers in a Test innings after hitting 259 in the second Test against Pakistan.

Pakistan 64 for 3 (Babar 31*, Ghulam 12, Rabada 2-9) trail South Africa 615 (Rickelton 259, Verreynne 100, Jansen 62, Abbas 3-94) by 551 runs Pakistan's horror day in Cape Town was complete after South Africa ripped through their top order to leave them staring down the barrel of a huge defeat.

South African wicketkeeper Kyle Verreynne said his side "need nine more big wickets" after the Proteas dominated Pakistan on the second day of the second Test against Pakistan at Newlands on Saturday.

Ryan Rickelton moves joint-seventh in South Africa's all-time top scorers in a single Test innings after scoring 259 in the second Test against Pakistan.