Box office: 'The Wolverine' claws its way to No.1 with $21 million on Friday

"The Wolverine" will claw its way to No. 1 at the box office this weekend, but the climb is tougher than first anticipated. The 20th Century Fox "X-Men" spin-off slashed its way to a solid, but unspectacular, $21 million on Friday night, and will likely earn around $56 million for the weekend.