Medium-pacer Andrew McDonald took advantage of a lively pitch to claim 5-21 as South Australia collapsed for 100 in their Sheffield Shield clash at the MCG.

South Australia had resumed on Tuesday’s second day of play on 4-81 in reply to Victoria’s first innings of 220 and the Redbacks suffered a spectacular collapse, losing 6-19 in 15 overs.

Test quick Peter Siddle (3-34) removed Travis Head lbw for two in the second over of the day and Adam Crosthwaite was caught behind for a duck off McDonald.

McDonald claimed the key wicket of South Australia’s leading scorer this season Tom Cooper who was bowled for 15 and Siddle broke through Joe Mennie’s defences for three at 8-99.

McDonald picked up his fourth wicket when Carl Tietjens was caught at third slip for a duck.

Peter George also fell to the former Test allrounder McDonald, whose 5-21 came off 16 overs.

Young seamer Mennie took 5-43 on Monday to continue his fine debut season for South Australia after McDonald (72) and Siddle (41) added 95 for Victoria’s eighth wicket to rescue the innings from a precarious position at 7-118.