South Africa established an iron grip on the first Test against New Zealand on Saturday, reaching 359 for five at University Oval at lunch on the fourth day for a lead of 324 runs. The visitors added 91 runs for the loss of two wickets in the morning session with the looming question of when or if to declare with forecast rain expected to reach the ground in the afternoon session. South Africa resumed the day on 268 for three and New Zealand claimed the prized scalp of Jacques Kallis early with the master all-rounder adding only six runs to his overnight 107. In contrast to his patient display on the third day, Kallis played a rash shot to a full-length delivery from left armer Trent Boult and the ball went directly to Rob Nicol at midwicket to leave South Africa 283-4. Kallis's 113 was his 42nd Test century and moved him ahead of Ricky Ponting as the second most prolific century-maker behind Sachin Tendulkar with 51. AB de Villiers, who like Kallis fell for a duck in the first innings, reached 29 before he attempted to belt part-timer Kane Williamson out of the park and was caught at deep midwicket by Brendon McCullum. Jacques Rudolph, 13 not out overnight, took on the senior role at the crease and had advanced to 59 at lunch with Mark Boucher on five. Doug Bracewell, who has taken three wickets in the South African second innings, had no luck in the morning session. Boult has one for 63 and Williamson has conceded just six runs from his six overs, taking one wicket.