Trainers Bryce Heys and Leon Corstens produced two horses they hope will go deeper into the spring after wins at Pakenham on Wednesday.
Spieth broke his maiden status with a hard-fought win in the opening race for Heys while Mr Individual corrected his wayward manners for Corstens.
The three-year-olds are likely to face off against each other in the Caulfield Guineas Prelude (1400m) at Caulfield on September 26.
That race will determine whether they will be competitive further into the spring.
“I thought he was vulnerable today,” Heys said.
“It was his second start, a smaller field and he was going to be exposed a long way out.
“But he’s got a vicious turn of foot.”
Spieth was an unlucky debut second at Sandown on September 2, but still raced greenly over 1200m on Wednesday, which Heys said was surprising.
“He’s going like a good horse at home, but to race as greenly as he did is a bit of a mystery,” he said.
“We’ll continue to iron that out and he’s going to be a nice horse going forward.”
Mr Individual scored a Bendigo debut win in June before being thrown in against Group Three company at Caulfield on August 29.
He ruined his chances by racing erratically before the home turn in finishing seventh to Gold Symphony.
He was sent back to trial and had blinkers added to his gear in his 1200m success on Wednesday.
“He’s still learning all about it which he’s very slow at, at the moment,” Corstens said.
“He’s like a big kid. Hopefully he can learn enough before we get him to the Guineas.”
Peter Moody, who faces a raceday treatment charge following the scratching of Lady Tatia, had Armada record back-to-back wins in taking out the Stone Federation Handicap (1200m).