Las Vegas casino owner Derek Stevens inadvertently upped the ante during his second annual NCAA Tournament betting binge. For the second straight year, the owner of the D Las Vegas and Golden Gate wagered $11,000 to win $10,000 on each of the 32 opening lines moments after they were posted Sunday during a live show on VSiN.com. But when the stacks of cash settled into the coffers of the South Point and Golden Nugget sports books, Stevens had actually wagered a total of $363,000 — or $11,000 more than the $352,000 he bet last year. “Last year was kind of tough. I had to make every bet within 10 seconds of being told the line,” he said. “To try to do it by yourself is impossible. This year, we had some of our team come down and they kind of helped me out. And we used two books to get all 32 bets in at a little better number.”