However, the Northern Irishman was still left ruing what could have been, after crashing heavily out of a commanding lead in the final moto of the weekend.
Irwin qualified in fourth, but finished the first two races in third, improving his speed throughout the weekend and giving himself the best chance of taking the win in he final race.
In the final moto he took a superb holeshot and streaked into a convincing lead, a lead which lasted until just three laps from the end when he crashed heavily. Gathering his thoughts and his RM-Z450, he remounted, but finished seventh at the flag.
He commented afterwards, “Today was going really well until a couple of laps before the end of the last race.
“I came over one of the big step downs and had a massive crash, the biggest I’ve had in a while. I threw away the race win but I wasn’t going to give up and got back on the bike and got on the podium overall.”
Team Manager Neil Prince added, “Graeme moved it up a level today, especially in that last race he really showed how good he and the RM-Z450 are.
“But one mistake and it’s all gone. The poor kid doesn’t quite seem to get a break. He had the others beaten but one mistake and it was taken away.”