Clarke hundred keeps Australia ahead against S. Africa
Australia's batsman and captain Michael Clarke (C) celebrates after reaching the 100 run mark on day 2 of the third test match between South Africa and Australia at Newlands stadium in Cape Town on March 2, 2014 - by Luigi Bennett
Clarke made 137 not out in an Australian total of 434 for four at lunch.
Australia added 103 runs for the loss of Steve Smith's wicket on a chilly, windy morning.
With strike bowler Dale Steyn out of action after suffering a hamstring injury on the first day, the key for Australia was to prevent the South African bowlers from making a breakthrough early in the day with an almost-new ball.
Kyle Abbott bowled an outstanding spell of six overs during which he conceded only one run, but couldn't take a wicket, while Vernon Philander went for 39 runs in his six-over morning spell.
Clarke, who was on 92 overnight, quickly went to 99 but then faced 24 deliveries - 23 of them from Abbott - without being able to get the run to bring up his fifth century against South Africa.
It finally came with a cover drive for four off Philander. He had faced 215 balls and hit 11 fours.
Smith, meanwhile, played some aggressive strokes as he made 84 in a fourth wicket stand of 184 with Clarke before he chopped a wide delivery from part-time left-arm spinner Dean Elgar into his stumps. He hit nine fours and three sixes in a 155-ball innings.
Shane Watson, playing in his first match of the series, survived a review off the first ball he faced when Elgar appealed for leg before wicket. He was on 21 not out at lunch.
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