The two youngsters sold for $300,000 each and were among the 37 individual lots to sell for six figure prices across the session.
The Not A Single Doubt x Celebrity Appeal colt, offered by South Australia's Cornerstone Stud, is a half brother to two winners.
Purchased by Sydney based bloodstock agent James Bester, he is the fourth foal of a twice raced One Cool Cat half-sister to stakes winners Walking Or Dancing and Irongail.
His dam is also a half-sister to grand producer Youthful Presence, the dam of four stakes winners including G1 stars Hauraki and Kidnapped.
The second $300,000 colt offered by Aquis Farm is by Snitzel from Euryale.
Leading New Zealand bloodstock agent Paul Willetts secured the fourth foal of the Gibson Carmichael Stakes winner Euryale, a five time winning daughter of Lonhro.
The Snitzel colt is a three quarter brother to Group performer Athena Lass and closely related to multiple Group winner Sweet Redemption.
Noorilim Park's Written Tycoon colt from La Llorona sold to Fernrigg Farm for $290,000 and Aquis Farm's Not a Single Doubt x Cariad colt sold to Ampulla Lodge for $280,000.
The top priced filly was Sledmere Stud's Kingman filly from Bethsaida snapped up by Kitchwin Hills for $260,000.
Taking the honours for the first season sires on Day One was Golden Slipper and Magic Millions Classic winner Capitalist.
A graduate of the Gold Coast sales ring, Capitalist had weanlings sell for $255,000, $200,000, $170,000 and $165,000.
US Triple Crown winner American Pharoah had a filly from the High Chaparral mare High Valyrian sell for $200,000.
Over $10 million was traded on 168 lots sold at an average price of almost $60,000.
"We are pleased with the opening day of the sale with some 37 lots sell for $100,000 or more and 13 made $200,000 plus,” said Magic Millions managing director Barry Bowditch.
"It was a good solid day of selling. There was good buying at the middle and lower end.
"We're slightly disappointed with the clearance rate of 75 percent but we hope over the next two days of the sale that will improve."
MAGIC MILLIONS NATIONAL WEANLING SALE STATISTICS
(2018 in brackets)
Lots Catalogued: 265 (280)
Lots Sold: 168 (191)
Lots Passed In: 56 (43)
Lots Withdrawn: 41 (46)
Sale Gross: $10,067,500 ($11,640,000)
Top Price: $300,000 ($650,000)
Average Price: $59,926 ($60,942)
Median Price: $30,000 ($40,000)
Sold %: 75 (82)
DAY ONE TOP LOTS
$300,000 - Not a Single Doubt-Celebrity Appeal colt (Lot 53)
Vendor: Cornerstone Stud (As Agent) / Buyer: James Bester Bloodstock (NSW)
$300,000 - Snitzel-Euryale colt (Lot 145)
Aquis Farm Operations (As Agent) / Paul Willetts Bloodstock (NZ)
$290,000 - Written Tycoon-La Llorona colt (Lot 258)
Noorilim Park (As Agent) / Fernrigg Farm (NSW)
$280,000 - Not a Single Doubt-Cariad colt (Lot 44)
Aquis Farm Operations (As Agent) / Ampulla Lodge (Vic)
$260,000 - Kingman-Bethsaida filly (Lot 15)
Sledmere Stud (As Agent) / Kitchwin Hills (NSW)