Having only moved up to the senior ranks this year, the 16-year-old said he was nervous heading into his first national race at the pro level, but the multiple junior champion did not show it, qualifying fourth.
He then went on to take out both races unchallenged to win the round.
Bosnakis went into round two of the Pro Quad Championship in third spot behind Anthony Pearce and Luke Gaisford, who is now out with an injury.
He won the first race but the second saw him come off his bike, though he managed to finish the race to pick up some championship points in 13th place. He then won the third race, but it was Pearce who took the round.