Pittsburgh Penguins' Sidney Crosby, left, is visible through the glass as he skates with Chris Kunitz at an NHL hockey practice on Friday, April 26, 2013, in Canonsburg, Pa. (AP Photo/Keith Srakocic)

Associated Press
Pittsburgh Penguins' Sidney Crosby, left, is visible through the glass as he skates with Chris Kunitz at an NHL hockey practice on Friday, April 26, 2013, in Canonsburg, Pa. (AP Photo/Keith Srakocic)
Pittsburgh Penguins' Sidney Crosby, left, is visible through the glass as he skates with Chris Kunitz at an NHL hockey practice on Friday, April 26, 2013, in Canonsburg, Pa. (AP Photo/Keith Srakocic)
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