Losing the X-factor: Hyundai fumbles in U.S. as former hit car Elantra stalls

SEOUL (Reuters) - At last February's Super Bowl, Hyundai Motor hired 'X-Men' movie star Ryan Reynolds for an ad plugging the new version of its Elantra sedan. Not in the script: a slide in first-half sales of the South Korean automaker's U.S. mainstay.