LAHORE, Oct 11 (Reuters) Pakistan were 108 for one at close of play on the fourth day of the second test, chasing an improbable victory target of 457 after centuries from South Africa captain Graeme Smith and Jacques Kallis.
At the crease, Kamran Akmal was on 49 and Younis Khan had made 48 as Pakistan fought hard after the early loss of opener, Salman Butt for six.
''It is not going to be easy out there if we get a few things right,'' the South Africa skipper Smith told reporters.
''They have to score at four runs an over and on the last day where the ball is really turning and doing some reverse swing, it is going to be very difficult for them.'' South Africa declared on 305 for four at tea leaving Kallis unbeaten on 107 for his third century of the series.
He enjoyed a third-wicket stand of 207 from 431 balls with Smith (133), who scored his first hundred in 17 tests and first on the subcontinent.
The partnership was broken in the second session after Pakistan took the second new ball and spinner Danish Kaneria finally got Smith to miscue a sweep to point. He had batted for 407 minutes, 296 balls and hit 17 fours.
South Africa won the first match by 160 runs and could wrap up the series 2-0, making them the first team to win back-to-back tests in Pakistan since Sri Lanka in 2000.
Beginning their second innings after tea, Pakistan lost Butt in the sixth over when substitute Shaun Pollock took a smart catch at third slip off Makhaya Ntini's bowling.
But on a pitch which is playing up and down, Younis and wicketkeeper Akmal fought back with some courageous batting and kept the score moving with some good shots.
Younis, who hit eight boundaries, was in a particularly aggressive mood, executing some powerful drives as he faced 74 balls.
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