Sent out a $5 chance in Saturday's Eureka Stockade (1400m) at her third start, The Closer settled in behind the lead before striding clear in the straight under Linda Meech to win by 2-3/4-lengths.
Winning Partner, the $4.40 favourite, led home the chasing pack in second with another two lengths to Bricktop ($10) third.
“Really from the day she won her first start at Geelong we always thought she was fairly smart,” Eustace, who trains in partnership with Ciaron Maher, said.
“She's stakes class for sure. She probably showed that today anyway.”
“We always felt she would get a trip,” Eustace said.
“We've kept her nice and relaxed and there's a nice race in her for sure.
“She could get an Oaks trip. She's quite brilliant as well though and she's got a turn of foot.
“It would be a question mark to see how far she gets.”