WASHINGTON (Reuters) -A single winning ticket for a Mega Millions lottery jackpot of $1.28 billion, the second-largest in U.S. history, was sold in Illinois, lottery organizers said on Saturday. “Congratulations to the Illinois Lottery for selling the winning ticket for the $1.28 billion Mega Millions jackpot,” Ohio Lottery Director Pat McDonald said in a statement. “We’re eager to find out who won and look forward to congratulating the winner soon!” The statement did not say which Illinois city the ticket was sold in. The holder of the winning ticket, which would have cost $2 to buy, matched …