Three films - "American Hustle," "Gravity" and "12 Years a Slave' - cemented their frontrunner status for the Oscars on Thursday in what is shaping up to be a highly competitive year for Hollywood's top honors. Director David O. Russell's 1970s con-men caper "American Hustle" and Alfonso Cuaron's space thriller "Gravity" each won 10 Academy Award nominations, while Steve McQueen's brutal depiction of slavery in "12 Years a Slave" secured nine. All three films garnered nods for best picture and best director. "This has been an amazing ride, and to receive nine nominations from the Academy is testament to all of the hard work," said McQueen, a British filmmaker who unearthed the real-life American story about a free man sold into slavery. But in a year hailed as one of high quality for the Hollywood industry, several other films could challenge the favorites in the race for the world's top film