There's no shortage of players in the NHL who can bury an empty-net goal or tack on the seventh marker in a 7-3 blowout victory. Those aren't tough plays to make. There's no pressure when you're just padding a lead or sealing a win.
On the other hand, there's only a handful of guys in the league who can truly be described as clutch. The kind of player who makes the opposition cringe every time he gets the puck on his stick when the game is on the line.
There are more ways to be a pressure player than piling up game-winning goals, though. Games can be won and lost on a single blocked shot or spectacular save.
Clutch players find ways to contribute when the game is on the line and are completely necessary and vital to any Stanley Cup run.