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Robertson scored his first win - just weeks after joining his father, Peter, in a training partnership - in style when Vintage Beach and driver Samantha Ottley held out Touche and Sheree Tomlinson by half a head in a thrilling finish to race 2.
The rookie trainer said he was thrilled to notch his first win with just his 10th and 11th starters at the races.
"It was a big thrill," Robertson said.
"It's been good so far, although it has probably been a bit of a shaky start with a few horses coming off lengthy spells and taking a few starts to really shape up.
"But things have hopefully turned the corner now."
Robertson has been a regular at race meetings across the South Island, on hand with the team that was previously trained under his father's name.
This season, the timing seemed right for the horseman to take out his licence.
"I have been involved all of my life, really," Robertson said.
"We have been in an unofficial partnership for the last couple of years before we decided to finalise things up this year."
Some fine tuning helped Vintage Beach bounce back to form with a fighting victory after battling in his two previous starts, following an extended spell.
"He was awful last start, but he blew pretty hard and we found a couple of things that weren't quite right," Robertson said.
"So, we upped his work and it seemed to do the trick today."
Robertson has a keen eye for a horse and has acted as an agent in a good number of sales to Australia.
He has also found plenty of horses that he and his father have bought and turned into winners.
Robertson also has shares in horses that have been placed with other trainers.
His night got even better when one of those - Jamie's Bad Boy - won race 6.
The Mark Jones-trained pacer went from zero to hero, as he went into last night's win after producing a shocking last start performance at Timaru.
Jamie's Bad Boy looked set for a huge victory after sitting pretty throughout before he threw his chances away with a gallop when clear in the home straight.
There were no similarly dramatic scenes when the 6yr-old won last night.
Robertson again notched a win with driver Samantha Ottley, who steered Jamie's Bad Boy to a comfortable victory.
There was another first at Forbury Park last night, with junior driver Kerryn Tomlinson scoring her first double.
She drove Mordecai to win race 3 and Sweet Mary to win race 4, the meeting's feature pace.
Tomlinson's race-to-race double took her to 10 career victories.