Williams broke then with a forehand passing shot, highlighting the extra power she said had given her an edge.
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Murray was hitting the ball cleanly and confidently, and when Federer wasted a chance to get the break back in game three with a poor forehand drop shot, the unusually frustrated reaction from the Swiss said it all.
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Former tennis great John McEnroe has called Federer's forehand the greatest shot in the sport--and it's already won him 13 Grand Slam singles titles.
Cypriot Baghdatis, finalist at the 2006 Australian Open, failed to find his rhythm against the unseeded Dutchman who used his height advantage, a stunning forehand and drop shot to great effect.
Federer then dominated the tie-break, a forehand return and a drop shot helping him win five of the last six points.
Later, Tsonga attempted a down-the-line forehand winner, a tough shot because the ball must travel over the outside of the net, which is six inches higher than the middle.
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But the Briton took the next four points, gaining a crucial one on the Frenchman's serve when he was quick to react to a drop shot and steer a forehand winner cross court.
So instead of going to his backhand, Nielsen kept the puck on his forehand side and flicked a soft wrist shot toward the net.
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.
The set now back under his control, Murray closed it out with another break as he fired one brilliant winner down the line from deep behind the baseline, before racing in to collect a drop shot and whip a cross-court forehand past Federer on set point.
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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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There was another twist in this strangest of matches when Wawrinka fired a forehand long in the following game to hand the break straight back, but a magnificent drop shot in game five helped the Swiss regain the advantage and this time he held on.
That's a defensive shot for all but the best, but Nadal came around on it sharply, cracking a rocket forehand that ripped the inside line.
Addressing the tennis ball as if playing a golf shot, McIlroy tried surprise tactics on Sharapova by quickly starting a rally with a top-spin forehand.
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