Untapped Queensland sprinter Bradbury Chocolate has attracted plenty of interest ahead of his first start in metropolitan grade tomorrow.

The three-year-old filly opened as a $17 chance to win the Ambassador Travel Handicap (1200m) but had firmed into a $7 hope by Friday afternoon.

One punter wagered $300 on the five-time winner to stay unbeaten, before bets of $300 and $200 each way at $15, and a $300 win bet at $13.

Bradbury Chocolate has won her first five races by a combined 36.5 lengths, but the first four of those were at the picnics.

Meanwhile, Temple Of Boom has been heavily favoured to take advantage of recent rain in the Group 1 Doomben 10,000.

Temple Of Boom has firmed from $17 into $13 with one punter plunging $500 at the opening quote.