The latest US Mega Millions jackpot has climbed to nearly $US1 billion ($A1.4 billion), the largest ever for the contest.
It will be the second biggest US lottery on record, trailing a $US1.586 billion Powerball jackpot paid out in 2016.
The drawing, which rose from $US667 million on Tuesday when no one had the lucky six numbers, will take place on Friday.
Powerball will hold a separate drawing on Saturday for an estimated $US430 million jackpot.
The immediate cash value of the Mega Millions prize is $US548 million, otherwise $US970 million is paid out over 29 years.
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Each of the 24 semi-weekly drawings have failed to produce a top winner since July 24, when an 11-member office pool in Santa Clara County, California, hit a $US543 million jackpot.
The odds of winning the Mega Millions jackpot are one in 302,575,350.
