Justin Langer and Mark Waugh hammered centuries as the touring Australians dominated the second day of their four-day match against South Africa A at St George's Park here Saturday.

Langer hit 161 and Waugh 110 as the tourists made 452 for five in reply to South Africa A's 301 all out.

The pair put on 207 in a third wicket stand which took only 155 minutes as South Africa's second string bowlers were thrashed on an easy-paced pitch.

South Africa A struck back towards the end of the day, however, with three wickets falling for four runs in the first three overs with the second new ball.

Paceman Dewald Pretorius dismissed Mark and Steve Waugh in the space of seven balls to finish with three for 101.

The 24-year-old bowled at a lively pace and could have an outside chance of bolstering South Africa's injury-hit attack for the second Test which starts in Cape Town on Friday.

Australian fast bowler Brett Lee took two wickets with his first two balls of the day as the last three South Africa A wickets fell cheaply. Lee finished with four for 37.

It was a continuation of a collapse which started Friday when Lee came on to bowl. In one over with the old ball and three with the new ball, Lee took four for nine as South Africa A lost their last six wickets for 18.

Langer was troubled several times by Pretorius before he and Darren Lehmann settled down in a first-wicket stand of 103. The lefthander went on to make his 55th career century off 182 balls. He made his next 61 off 65 balls, adding five more fours and a six.

Mark Waugh moved fluently to a half-century off 76 balls and needed only another 24 deliveries to reach his 79th first-class century.