A photograph of the the front of Tecnifibre X-One Biphase in the sand at the beach on a sunny day.

Tecnifibre X-One Biphase String Review & Playtest

Everything You Need to Know

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X-One Biphase is a premium multifilament string that combines the best of Tecnifibre’s technologies into a single string to produce power, comfort, and gut-like feel.

One of the string’s standout qualities was comfort. Even strung at a higher tension, X-One Biphase still retains its cloud-like comfort, which is ideal for players suffering from tennis elbow or simply looking for an all-around arm-friendly string.

However, X-One Biphase’s star quality was its raw power, which is at the top of its class. The ball jumps off the strings, making for a really fun playtest, especially when I had the opportunity to crank a few winners.

Combine the string’s comfort level with its power, and it makes for a unique combination where the string is naturally comfortable on your arm, and you don’t have to work too hard or strain your arm to generate pace.

While the string’s slick coating contributes to its power and comfort level, it did leave us longing for a bit more grip. However, after about 30 minutes of playtime and a little extra focus on generating topspin, I began to find my rhythm.

X-One Biphase is an all-around terrific multifilament string that’s great for players looking for extra comfort and some extra pop.