In Mixed Doubles a girl has a very important part to play. Practically speaking, she has to work for all the openings for her partner, who comes in and kills. And very often if in watching a mixed double you are inclined to think the man is doing little work, or that he is playing badly, it is because his partner is getting him no "plums." She is playing a poor length, or not keeping the ball out of the reach of the opposing man. It is a good plan to keep your head well down, and of course your eye glued on the ball, until the very last moment, so that it makes it difficult for the opposing man at the net to tell in which direction you are going to hit the ball. The late Miss Robb, who was a magnificent mixed doubles player, used to play in this way. Men have told me it was impossible to anticipate her returns. Keeping your head down will also help you from getting flurried or put off, however "jumpy" the opposing man is, or however much he is running across. You can always have a mental vision of him to tell you where he is without looking at him.
To play a mixed double you must be able to lob. It is really the most necessary stroke to cultivate. A very good return of the opposing lady's service, when both men are at the net, is a lob back to the server. It is much safer than lobbing over the man's head—if at all short your ball will be instantly killed—and it also gives your partner at the net plenty of time to anticipate any kind of return. It will be difficult for the server to return a good-length lob out of your partner's reach. The opposing man at the net will not be able to do anything with this lob—it is quite out of his reach—and it would be useless for him to run across as he might do for a cross drive. It is usually best, I think, for a lady to serve down the centre of the court in a mixed double. It shuts up the angles of the court more, and there is less risk of her partner being passed down his side line.
Do not enter for too many events in a tournament. You may get thoroughly worn out and not able to do yourself justice in any, and you would probably have to play when you were very tired—bad for your game, and worse still for your partner's chance in a double. Remember that before playing an important match it is very injudicious to watch another game. It is likely to put your eye out. If possible, do not travel by train just before playing, or carry anything heavy, such as your tennis bag, for this will make your hand shaky and unsteady.
To sum up, there are five golden rules which I have found very helpful to me when playing an important match. I give them to you in the hope that they may prove equally valuable. Always remember that constant practice of these rules will make their pursuit natural in a match.
I. KEEP YOUR EYE ON THE BALL
You have so often been told this, I know, and perhaps the familiar ring about the advice may evoke contempt. Yet unless this rule is implicitly obeyed you cannot expect much success at lawn tennis. Taking your eye off the ball is the secret of every mis-hit and mis-timed stroke. You must not be content merely to look at the ball, but follow it right on to your racket; watch it up to the actual moment of striking. The court and the position of your opponent must be mentally engraved at the same time. How frequently attentive observation will reveal a player lifting his or her eye from the ball a fraction too soon! Always be on your guard against this inclination. It is at first done almost unconsciously, but it soon becomes a habit.
II. KEEP YOUR MIND ON THE GAME
This is a most important rule. As I have remarked before, complete concentration is absolutely necessary to success. If you are worried about anything, business or home affairs, it is bound to affect your game. Think of absolutely nothing but the game you are at the moment playing. Your whole personality must be absorbed. To play the game well demands the use not only of limb and muscle, but heart, eye, and brain. The first rule will help the second, because your attention must be more or less fixed on the game if you are carefully watching the ball the whole time.