Question: Is the eastern group used for backhands?
About the article "Tennis", section "Grip".

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  Often players choose their backhand type based on their handedness—if the player is somewhat ambidextrous, the two-handed backhand might be best.
Starting from the 1970s, many of the greatest players used the two-handed backhand and it has become more popular on the pro tour, especially on the women's side.
Two-handed backhands have some important advantages over one-handed backhands: * The backhands are generally more accurate because having two hands on the racquet makes the contact more stable.
This also makes it somewhat easier to impart topspin on the ball allowing for more control of the shot, while one-handed backhands generally require finer motor skills to generate topspin and are less consistent in longer rallies.
* Two-handed backhands can more easily hit higher balls.
* Two-handed backhands have a chance to be consistently closer in power and/or accuracy to the forehand, possibly even surpassing it, which is not the case with the one-handed.
People with a noticeably weaker one-handed backhand tend to get balls returned to them on that wing, giving them a disadvantage, especially with high kick serves and lefty slice serves.
* Two-handed backhands can be hit with an open stance, whereas one-handers usually have to have a closed stance, which adds further steps (which is a problem at higher levels of play).
* Two-handed backhands can change direction more easily than one-handed backhands, due to having more stability over the shot with two hands, allowing the player to control the shot better and place the ball with more precision.
* Two-handed backhands are generally more easy to develop and require less motor skills than a one-handed backhand to perform all the basic shots.
Since the 70s, juniors have been taught two-handed backhands more often than the one-handed backhand.
However, one-handed backhands have some other important advantages over two-handed backhands: * One-handed backhands allow greater reach, especially while on the run.
* One-handed backhands are able to hit lower balls with more pace and penetration than two-handed backhands.
They also can generate more power when properly set up, and can be very penetrating when hit correctly.
* One-handed backhand players move to the net with greater ease than two-handed players because the shot permits greater forward momentum and has greater similarities in muscle memory to the preferred type of backhand volley (one-handed, for greater reach).
This is why a majority of serve and volleyers employ a one-handed backhand.
* One-handed backhands should be hit more in front of the body than the forehand, which allows them to be hit with a deeper hit spot.
* One-handed-backhand players are much less likely to develop the habit of playing volleys with two hands, which is better for serve and volley play.
* One-handed backhands force players to hit high balls with slice, thus causing them to develop much better slice backhands than two-handed players.
* One-handed backhands can be put away more easily than two-handed backhands for finishing shots due to their flatter, more penetrating nature.
Strengths and weaknesses.
Generally, both backhands are efficient at what they do.
The type of backhand a player uses comes down to mostly personal preference and their game style.
Since the 1970s however, the two-handed backhand has had a spike in popularity and is now more widely taught than the one-handed backhand.
Many tennis greats use the one-handed backhand.
Such players include Roger Federer, Stefan Edberg, Pete Sampras, Justine Henin, Steffi Graf, Gustavo Kuerten, Amelie Mauresmo, Martina Navratilova, Stanislas Wawrinka, Don Budge, Ken Rosewall and Rod Laver. 
A grip is a way of holding the racquet in order to hit shots during a match.
The grip affects the angle of the racquet face when it hits the ball and influences the pace, spin, and placement of the shot.
Players use various grips during play, including the Continental (The "Handshake Grip"), Eastern (Can be either semi-eastern or full eastern.
Usually used for backhands.
), and Western (semi-western or full western, usually for forehand grips) grips.
Most players change grips during a match depending on what shot they are hitting; for example, slice shots and serves call for a Continental grip.
Bozoljac is known for his unique style of play.
He often changes the way he performs forehands and backhands, hitting double-handed forehands and single-handed backhands.
He also has a strong serve, but he has to limit the strength of his serve due to a back injury.
Nevertheless, he still serves well over 200 km/h. 
Vinci is known for her doubles prowess and relentless use of the backhand slice.
During the 2013 Rome Masters against Simona Halep, Vinci elected to perform a half volley blocked backhand.
The grass season saw her pull off a wide array of alternative backhands against Kaia Kanepi in 's-Hertogenbosch, including an extraordinary half volley crosscourt backhand winner on the run and a flicked backhand lob.
During her victory against Madison Keys at the 2014 Indian Wells Masters, Vinci hit consecutive non-sliced backhands at the baseline, albeit blocked half volleys. 
The player long considered to have had the best backhand of all time, amateur and professional champion Don Budge, had a very powerful one-handed stroke in the 1930s and '40s that imparted topspin onto the ball.
He used an Eastern grip, and some pictures show his thumb extended along the side of the racquet for greater support.
Ken Rosewall, another amateur and professional champion noted for his one-handed backhand, also used a continental grip to hit a deadly accurate slice backhand with underspin throughout the 1950s and '60s.
Connoisseurs of the game also rate Swede Henrik Sundström's one-handed backhand as technically magnificent and as powerful as many forehands, but Sundström's career was cut short by injury,In his 1979 autobiography, Jack Kramer devotes a page to the best tennis strokes he had ever seen.
He writes: "BACKHAND—Budge was best, with Kovacs, Rosewall and Connors in the next rank (although, as I've said, Connors' 'backhand' is really a two-handed forehand).
Just in passing, the strangest competitive stroke was the backhand that belonged to Budge Patty.
It was a weak shot, a little chip.
But suddenly on match point, Patty had a fine, firm backhand.
He was a helluva match player.
"On the men's pro tour, dramatic changes have occurred since then.
In the 1980s, many great players such as Stefan Edberg, Ivan Lendl, Henrik Sundström and John McEnroe were leading the charge with their one-handed versatile backhands.
But a new wave of players, such as Jimmy Connors, Björn Borg and Mats Wilander, started to show the world that two-handed backhands could also offer major advantages.
Players could now increase the speed and control of their two-hander in key defensive shots, such as returns, passing shots and lobs.
Since then, many players followed this trend.
Among the main ones are Andre Agassi, Jim Courier, Sergi Bruguera, Marat Safin, Novak Djokovic, Andy Murray, Rafael Nadal, David Nalbandian (owning the fastest recorded backhand at 110 mph (171 km/h)), Nikolay Davydenko, Lleyton Hewitt, Gilles Simon and Jo-Wilfried Tsonga.
However, the one-handed backhand is still used effectively by a few great players like Roger Federer, Richard Gasquet, Stanislas Wawrinka, Mikhail Youzhny, Nicolás Almagro, Tommy Haas and Grigor Dimitrov.
Justine Henin's backhand was considered on par with the men's, with John McEnroe saying "Justine Henin has the best single-handed backhand in both the men's and women's game.
Henin's backhand is described as a deadly weapon which is spontaneous, accurate and powerful.
She can hit drop shots with her deadly back hand.
"On the women's pro tour, one of the great rivalries of the 1980s was symbolized by two different backhand styles: Martina Navratilova's smooth one-handed sliced backhand versus Chris Evert's perfectly controlled two-handed backhand.
Many different styles of backhand arose in the late 1980s, including Steffi Graf's exceptional sliced backhand, and Monica Seles' two-handed backhand, characterized by its rapidity of execution.
The two-handed backhand began to gain popularity over the one-handed backhand in the 1990s (even though there had been great tennis champions whose backhand was two-handed, Chris Evert being an example).
Some of the most popular two-handed backhands of the modern game include Serena Williams, Martina Hingis, Venus Williams, Maria Sharapova, Kim Clijsters, Lindsay Davenport, Petra Kvitová, Li Na and Jelena Janković.
Janković is able to generate great power with a two-handed backhand can also create angles and is currently deemed as one of the best on tour.
The Williams sisters' double-handed backhand is considered one of the most powerful on tour.
They can damage their opponent from any corner of the court with this backhand, being able to create angles that are much more difficult to create with a one-handed backhand.
Li Na's backhand down the line is considered to be among the best on the WTA tour.