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A single ticket-holder has won £5.1million on Wednesday's Lotto draw.
The winning Lotto numbers were 13, 16, 23, 32, 37 and 57. The bonus ball was 15.
Saturday's estimated jackpot is £3.8million.
Set of balls one was used with draw machine Merlin.
Andy Carter, senior winners' adviser at the National Lottery, said: 'What wonderful news, one lucky ticket-holder has won tonight's enormous £5.1m Lotto jackpot!
'That makes two jackpot wins in a week after another lucky ticket-holder won the £2million jackpot in last Wednesday's draw.
The winning Lotto numbers were 13, 16, 23, 32, 37 and 57. The bonus ball was 15
'Players are urged to check their tickets and to give us a call to claim tonight's exciting jackpot prize.
'Thanks to National Lottery players, £30 million is generated every week for good causes right across the UK.
'This funds everything from hundreds of small projects in local communities, to supporting the growth of women's and girls' football right across the four nations as the Lionesses made history in this year's World Cup.'
No players won the £500,000 top prize in the Thunderball game but two players won £5,000 each by matching five numbers.
The winning Thunderball numbers were 26, 27, 28, 35, 38 and the Thunderball number was 4.
No-one scooped the top £350,000 HotPicks prize, which uses the same numbers as the Lotto draw, but three people won £13,000 each by matching four of the five numbers.
