Crosby didn't score the goal, but he set it up by storming unimpeded into the Islanders' zone, then firing a backhand shot.

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Murray closed to 3-2 after winning a 25-shot rally with a backhand sliced drop shot, but he double faulted on the next point and Djokovic took full advantage.

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The first came when Tsonga attempted a backhand passing shot down the line, toward Djokovic's forehand volley, rather than crosscourt to the backhand.

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They were tied at 4-4 before a rain break disrupted play for 45 minutes and although both pairs looked strong on the resumption, Jeremiasz sealed the first set with a delicate backhand drop shot which just crept over the net.

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At the moment, the racket's technology can identify the type of shot a player hits (forehand, backhand, serve), the kind of spin a player imparts on the ball and the power of a swing.

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But Tavares, the No. 1 overall draft choice in 2009, gave the Islanders a 1-0 lead just 5:36 into the game by taking a backhand pass from Josh Bailey, taking an extra beat to pick a spot, then snapping a shot over the glove of Penguins goaltender Tomas Vokoun.

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So instead of going to his backhand, Nielsen kept the puck on his forehand side and flicked a soft wrist shot toward the net.

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That's a little lazy from Murray, dabbing an attempted drop-shot wide, but he then chases down a lob before punching home a backhand winner.

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Rather than move the puck to the boards and out of danger, Niskanen attempted a backhand clearing pass up the middle only to send it directly to Porter, who had little trouble flipping a wrist shot by Vokoun for Porter's first goal since March 12, 2012.

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