South Africans face an uphill task of survival on a spinning pitch on the last day of 2nd cricket Test match against hosts Sri Lanka in Colombo tomorrow.The visitors need another 331 runs as they ended the day four on 38 for 1.Earlier on Sunday, Sri Lankans batted fast to extend their lead. With the help of 72 by Sangakkara and an unbeaten 63 from Mathews, the hosts declared at 229 for 8, setting a target of 368 before the South Africans.South Africa had won the first Test at Galle in the two match series.