Victoria 278 (Harper 151, W Agar 5-45, Doggett 4-73) and 12 for 1 lead South Australia 252 (Fraser-McGurk 101, Manenti 51, Scott 50, O'Neill 5-28) by 38 runs

After belting the third-fastest Shield hundred in history during some early evening fireworks on Tuesday, Harper kept going on Wednesday morning. He was eventually out for 151, the best score of his first-class career, as the visitors were all out for 278.

Victoria were reeling at 29 for 4 before Harper went to work with a masterclass of controlled hitting.

But former Victorian batter Fraser-McGurk was not to be outdone, hitting 101 from 106 balls to steer South Australia within distance of the tourists' total.

Fraser-McGurk, who left Victoria at the end of last season, was particularly impressive when you consider the Redbacks were in trouble at 16 for 4.

However, he was involved in a strange incident when he had 19 and was initially given caught at slip off spinner Doug Warren. It was clear on replays that he had not hit the ball and, after starting to walk off, umpire Michael Graham-Smith changes his mind and Fraser-McGurk was recalled - to the frustration of his former team-mates.

"I missed it by probably three feet, it spun a fair bit and I think it came off Sam Harper's glove before Peter Handscomb caught it," Fraser-McGurk told cricket.com.au after play.

"Sometimes they [opposition teams] are just like 'yay' and it could have been not a serious appeal, but then the umpire's starting to nod his head and I was a bit in disbelief. So I started walking off, then seconds later he changes his decision and the Vic boys weren't too happy with that because they think they had a few unlucky decisions."

Cameos from Ben Manenti and Liam Scott helped South Australia reach 252, trailing Victoria by just 26.

He was given excellent support by evergreen veteran Peter Siddle, who caused significant issues for South Australia's top-order by taking 3 for 53.

In response, Victoria's second innings got off to a rocky start as they had to negotiate a tricky period before stumps.