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You may be hitting a good angle on your cross-court from the front but are you getting the maximum benefit? When the ball bounces on the floor before the side wall it will sit up off the side wall which will give your opponent more time to reach it and play a good reply. If you can get that ball striking the side wall before the floor it will die down quickly off the side wall. In addition to giving your opponent less movement time the ball will be lower to the floor when they want to hit it!
When players hit a straight drive short, they know this length can be improved next time by aiming slightly higher on the front wall . The same principal applies for the cross-court! If your cross-courts tend to bounce before the side wall then try and aim your shots higher. An extra 1/4m in front wall height will add and that crucial metre in length taking the ball directly onto the side wall.