"First Immortal, really progressive, challenged him and he kept laying down the gauntlet.
"He's a deserved winner of the 'Golden Ticket' into the Melbourne Cup and he was dominant today."
Eustace said Future History was likely to go straight into the Melbourne Cup without another start.
After starting his career in France, Future History had his first Australian start at Sandown in June and was a winner at Moonee Valley in late August.
Mark and Levi Kavanagh, who prepare the runner-up First Immortal, were ruing a poor draw with their stayer who was also racing for the 'Golden 'Ticket'.
First Immortal was trapped wide early and was never closer than three-wide for the journey.
"We opted to run this week instead of next week (Herbert Power Stakes) because we wanted to have a go at The Cup," Levi Kavanagh said.
"The wide alley cost us today. It was a great run and if we had drawn a gate, maybe the result would have been different.
"We've still got a horse and he's going to figure in a good race, somewhere, in the next few weeks."