Hybrid tennis strings: which string in the mains, which in the crosses?
A hybrid is two strings in one string bed: one in the mains, the other in the crosses. It is often pictured as a compromise, half the comfort of one and half the durability of the other. That is not how it works. A hybrid gives each direction of the string bed the job it actually does, provided you know which job that is.
What the mains do, what the crosses do
The mains are the long strings, from head to throat. At impact, they are the ones that slide sideways over the crosses, then snap back into place before the ball leaves the string bed: that is snapback, and it adds spin. They are also the ones that wear, each slide cutting a notch at the crossing. Mains break, almost always.
The crosses barely move. They act as a rail: the smoother their surface, the better the mains slide over them and come back.
Two things follow. The life of a string job is decided in the mains. And the string bed's ability to make spin depends as much on how slick the crosses are as on how much the mains bite.
The three setups that make sense
Monofilament mains, multifilament crosses
The most common setup. The monofilament takes the wear where it happens; the multifilament softens the impact. But the whole behaves closer to the stiffer of the two than to the average, and the multifilament, which grips more, slows the mains' return a little. It is a comfort setup for a player who breaks strings, not a spin setup. The difference between the two materials is covered in polyester or multifilament.
Multifilament mains, monofilament crosses
The reverse hybrid puts the soft string where the ball does its work, and feel improves. Durability does not: in the mains, the multifilament wears like a multifilament, by abrasion, and it is the one that breaks. Best kept for players who don't break strings and want feel without a fully soft string bed.
Two monofilaments of different shapes
The most useful setup for spin, and the least known. A shaped profile in the mains bites the ball; a round string in the crosses gives the best glide. The two qualities add up instead of diluting each other: a round string does not bite, a hexagonal one does not slide, and the hybrid gives each the direction where its weakness does not matter.
With the N°1 → N°7 range
Three pairings, as reference points rather than prescriptions:
More spin: N°7 (hexagonal, the most controlling) or N°4.5 (pentagonal) in the mains, N°5 (round) in the crosses.
An arm that complains, but mains that break: N°3 or N°4 in the mains, N°1 (multifilament) in the crosses.
Chronic breaker: N°6 in the mains, N°5 in the crosses. The mains last, the crosses glide and last.
Each number sits on its own elongation curve: the curve says what the string gives back at the tension you string it at.
Tension in a hybrid
It is common to use the same value for both strings. That is a shortcut: at equal tension, two strings do not stretch by the same amount and do not return the same energy. A multifilament strung at a monofilament's tension is not in the same zone of its curve.
The safest method: start from your usual tension for the mains string, place the crosses string on the elongation curves, then change one parameter at a time, over several sessions. On choosing the value itself: what tension to string at.
Stringing it: always four knots
A hybrid is strung in two pieces, one for the mains and one for the crosses. That is the four-knot job described in the full method and followed by the stringing assistant. Each piece is measured separately: on a 16 × 19, seventeen lengths of the centre main for the mains, eighteen lengths of the centre cross for the crosses.
Frequently asked questions
Does a hybrid last longer?
If the tougher string is in the mains, yes: that is where the wear happens. The other way round shortens the life of the job.
Can two different gauges be paired?
Yes. Gauge is chosen separately for each direction, by the same rules as a full bed: a thinner gauge gives back more and lasts less. Since wear happens in the mains, that is where a thin gauge costs you. See which gauge to choose.
Should I tell my stringer?
Yes, with the direction: which string in the mains, which in the crosses, and the tension of each. It is the only way to repeat a job you like.
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