Tennis String Tension

Staying within the manufacturer's tension range, the general rule of thumb for string tension is as follows:

Tennis String Tension Chart

Higher tension = better control, less power, yields shorter shots
Lower tension = less control, more power, yields longer shots

Adjust string tension according to desired effect.

Tension for Spin

Staying within the manufacturer's recommended tension range, setting tension at the low end will improve spin and setting it at the high end will lower spin. As you lower tension the strings flex more and the ball stays on the string bed longer. This allows the strings to bite into the ball so that you can put spin on it. You don't want to go too low on the tension, however, because you will increase power and have trouble controlling your shots.

Tension for Tennis Elbow Prevention

Staying within the manufacturer's recommended tension range, having your racquet strung at a high tension amplifies the impact on your arm when you strike the ball. Staying at the mid-point or slightly below the recommended range is a safe area to stay in if you have tennis elbow problems.

Tension for Durability

Staying within the manufacturer's recommended tension range, setting tension at the higher end of the range will lend more durability to the strings. Setting tension at the low end of the range will decrease durability.