String tension refers to how tightly the strings are pulled when installed in your racket, measured in pounds (lbs) or kilograms (kg). It directly affects power, control, spin potential, and comfort. Lower tension creates a trampoline-like effect for more power and a softer feel, while higher tension offers better control and precision. Finding the right tension is crucial for optimizing your performance and preventing arm injuries.

Beginners should generally use lower to medium tension (48–55 lbs). Lower tension provides a larger sweet spot, more free power, and a more forgiving response on off-center hits. This helps build confidence and reduces the risk of arm discomfort. We recommend starting at the lower end of your racket's recommended range and adjusting based on feel.

A good rule of thumb is to restring as many times per year as you play per week. For example, if you play 3 times a week, restring at least 3 times per year. Polyester strings lose tension quickly and may need more frequent replacement. Even if strings haven't broken, they lose elasticity over time, negatively affecting playability and increasing injury risk.

Natural gut holds tension exceptionally well and provides excellent power and comfort. It can be strung 4–6 lbs higher than polyester without feeling harsh. Polyester strings are stiffer and should be strung lower (typically 48–55 lbs) to compensate for their rigidity. Many advanced players use a hybrid setup: natural gut in the mains for feel, polyester in the crosses for control.

Larger head sizes (oversize, ≥103 in²) have longer strings that stretch more on impact, creating a natural trampoline effect. To maintain control with a larger head, you typically need higher tension (55–65 lbs). Smaller heads (midsize, ≤94 in²) have shorter, stiffer string beds and benefit from lower tension (48–55 lbs) to add power and comfort.

Professional players use a wide range depending on their style. Rafael Nadal strings his Babolat Pure Aero at around 55 lbs with polyester. Novak Djokovic uses approximately 59 lbs (mains) / 56 lbs (crosses) in his Head Speed Pro. Roger Federer famously used high tension around 59–60 lbs with natural gut/poly hybrid. Most pros fall between 48–62 lbs, with polyester users trending lower.

Yes! In a hybrid string setup, many players use different tensions for mains and crosses. A common approach is to string the mains 2–4 lbs higher than the crosses. For a natural gut/poly hybrid, try gut mains at 56–58 lbs and poly crosses at 52–54 lbs. This differential helps optimize the performance characteristics of each string type.