CLIVE — A Clay County man has won a $10,000 Mega Millions prize. Robert Gabhart, of Spencer, matched four of five white balls and the Mega Ball in the Dec. 30 Mega Millions drawing. He was one number away from winning that night’s $685 million jackpot. Gabhart purchased his winning ticket at Hy-Vee Fast & Fresh, in Spencer. He claimed his prize Thursday at the lottery’s Storm Lake regional office. The winning numbers in the Dec. 30 drawing were 1-3-6-44-51 and Mega Ball 7.