A couple from the Scottish Borders has won half of the historic £66 million lottery jackpot.
The rollover Lotto prize was split between two tickets that had all six winning numbers from Saturday's draw - 26, 27, 46, 47, 52 and 58.
Camelot said one of the winning tickets has been checked and verified and the winners - a husband and wife from the Borders - are to celebrate their success at an announcement in Edinburgh on Wednesday.
A Lotto statement said: "A couple from the Scottish Borders are celebrating today after winning one half of last weekend's incredible £66 million Lotto jackpot.
"The husband-and-wife team are celebrating with a life-changing cheque for £33,035,323. The couple plan to enjoy their winnings and take early retirement."
Saturday's massive jackpot - the biggest ever - was the result of 14 rollovers.
New rules stipulated that once the amount went over £50 million it would have been shared between the next tier down of winners if no-one matched all six numbers.
On Monday, Lotto operators Camelot said the holder of one of the winning tickets had still not come forward and urged players to check their tickets again.
A spokesman said: ''Someone out there still doesn't realise they have won.''
Prize winners have 180 days after the draw date to come forward, which means Saturday night's joint winner has until July 7 to claim their prize.