Christchurch: Defending champions Australia scored their second victory by registering a 200-run win over Sri Lanka in a preliminary league match of the Women's World Cup 2000 at the Hagley Oval on Friday.Australia, taking first strike on winning the toss, scored an imposing 282 for three in 50 overs. This is the highest total of the tournament so far and Aussie vice-captain Karen Rolton helped herself to an unbeaten 154 off 118 balls with 19 fours.Rolton was involved in two big partnerships as the Aussies pounded the weak Sri Lankan bowling. Rolton and opener Lisa Keightley (56 runs, 94 balls and six fours) added 117 runs for the second wicket. The third wicket partnership between Rolton and Olivia Magno, which ended in the last ball, added 129 runs. Rolton was on a song and went on the rampage against the Sri Lankan bowling. Magno (38 runs, 50 balls), who lent splendid support from the other end, was run out off the last ball.Sri Lanka were never in contention in reply and kept losing wickets at regular intervals to be bowled out for 82 in 39 overs. The only partnership of note was between Dedunu De Silva (17) and Hiruka Fernando (15) of 28 runs for the second wicket.Australia had started their campaign with a fine victory over New Zealand in the inaugural match on November 29.