Amla retired hurt after being struck on the elbow by a lifter from Mohammad AmirSecond Test, Cape Town (day four):Pakistan 177 (Olivier 4-48) 294 (Shafiq 88, Rabada 4-61, Steyn 4-85)South Africa 431 (Du Plessis 103) 43-1South Africa won by nine wicketsScorecardSouth Africa strolled to a nine-wicket win over Pakistan in the second Test in Cape Town to take an unassailable 2-0 lead in the series.After bowling Pakistan out for 294 in their second innings on day three, the Proteas began day four needing to score only 41 to wrap up victory.They did so for the loss of Theunis de Bruyn, caught behind for four, while Hashim Amla retired hurt for two.But Dean Elgar's 24 not out helped see them over the line in 9.5 overs.De Bruyn was elevated to open in place of Aiden Markram, who made 78 in the first innings but suffered a bruised thigh while fielding on day three at Newlands.Meanwhile, Amla went off after being hit on the elbow by pace bowler Mohammad Amir - leaving slight question marks over him and Markrem for the third and final Test, which begins in Johannesburg on Friday.But there were no further worries for the hosts as skipper Faf du Plessis joined Elgar, who sealed victory with back-to-back boundaries off part-time bowler Azhar Ali.Following the Test series, the sides will meet in five one-day internationals and three Twenty20 matches.