Irish jockey Shane Jackson achieved the biggest win of his eight-year Australian stint with victory in the Grand Annual Steeplechase at Warrnambool on Tuesday.

The 33-year old Kiltegan rider claimed the biggest victory of his career aboard the Ciaran Maher and David Eustace trained Ablaze in front of deserted grandstands at the south-west Australian venue. 

The eight-year old horse held off Gold Medals and Zed Em, winners of the two previous renewals, to win and collect the  A$315,000 prize purse. 

Jackson was cheered on by his wife Lauren and son Joey, who were watching from home.

Wicklow jockey Jackson relocated to Australia in 2012 and was the leading jump jockey Down Under last year. 

"It was a great thrill to win the race that I've wanted to win since I came over here," Jackson told Racing.com.

"I've earmarked it as the one where I wouldn't be happy unless I won it."

"What a family I have at home. They are the best supporters in the world and to see the emotion and thrill they get out of it, I feel a very lucky person."

A small fraction of his winning percentage will go to paying a fine incurred for breaching social distancing guidelines, with Jackson and Maher - who was also sanctioned - having shook hands after the victory. 

The stewards report read: "Stable representative Declan Maher and rider Shane Jackson were each fined A$300 under the provisions of AR227(a) for breaking Racing Victoria Covid-19 protocol, in that they made contact on returning to the mounting enclosure."