Equipment profile · Manufacturer kit
Casper Ruud String Tension & Setup
Two Yonex polyesters in the athlete kit, no published tension, and why the kit does not tell you which string goes in the mains.
By String Tension AI · Published · Research checked
This is a source-based equipment profile, not an official Casper Ruud page. It reports what Yonex lists for Casper, compares that listing with our catalog row, and does not fill the missing tension with an estimate.
Yonex’s athlete page lists Casper Ruud with the Yonex EZONE 100 racquet and two strings, Yonex POLYTOUR SPIN 125 and Yonex POLYTOUR PRO 130. Two strings in one kit points to a hybrid of two polyesters, but the page does not say which string goes in the mains and which in the crosses. The kit names POLYTOUR SPIN in its 1.25 mm version and POLYTOUR PRO in its 1.30 mm version. Yonex states no string tension, and this profile does not show one as his setting: a product listing identifies equipment, not a stringing-machine reference setting. On October 3, 2026 we updated our catalog row to the kit: it now lists POLYTOUR SPIN 1.25 mains, POLYTOUR PRO 1.30 crosses and an EZONE 100 racquet record, replacing POLYTOUR PRO 1.25 and a VCORE 98. The kit does not assign mains and crosses, so that orientation and the catalog’s tension still come from the secondary report, not from Yonex.
Evidence: Yonex
Casper Ruud’s setup at a glance
- Player
- Casper Ruud
- Racquet
- Yonex EZONE 100
- Strings listed
- Yonex POLYTOUR SPIN 125 and Yonex POLYTOUR PRO 130
- Gauge
- 1.25 mm SPIN · 1.30 mm PRO
- Mains / crosses
- Not assigned by the manufacturer
- Reference tension
- Not stated by the manufacturer
- Catalog row
- Agrees; direction and tension from a secondary report
- Evidence status
- Manufacturer page, undated
- Research checked
- 2026-10-03
View all 69 sourced pro string setups →
What strings does Casper Ruud use?
Yonex POLYTOUR SPIN 125 and Yonex POLYTOUR PRO 130, as listed on Yonex’s athlete page.
Two strings in one kit points to a hybrid of two polyesters, but the page does not say which string goes in the mains and which in the crosses. The kit names POLYTOUR SPIN in its 1.25 mm version and POLYTOUR PRO in its 1.30 mm version.
What string tension does Casper Ruud use?
Yonex does not state a tension. A product listing identifies equipment; it is not a stringing-machine reference setting, a later stringbed measurement or a personal specification.
The Casper Ruud row in the pro string setups table carries a tension from Too Many Rackets, accessed by our catalog on 2026-07-16. We have not reconfirmed it for this profile, so it is not repeated here as his current setting.
How this profile compares with our pro setups table
On October 3, 2026 we updated our catalog row to the kit: it now lists POLYTOUR SPIN 1.25 mains, POLYTOUR PRO 1.30 crosses and an EZONE 100 racquet record, replacing POLYTOUR PRO 1.25 and a VCORE 98. The kit does not assign mains and crosses, so that orientation and the catalog’s tension still come from the secondary report, not from Yonex.
Scroll the table sideways to compare all source details.
| Field | Yonex (checked 2026-10-03) | Our catalog row (secondary source: Too Many Rackets) |
|---|---|---|
| Racquet | Yonex EZONE 100 | Yonex EZONE 100 |
| Strings | Yonex POLYTOUR SPIN 125 and Yonex POLYTOUR PRO 130 | Mains: Yonex POLYTOUR SPIN 1.25 mm · Crosses: Yonex POLYTOUR PRO 1.30 mm |
| Mains / crosses | Not assigned | Hybrid |
| Tension | Not stated | Listed by the secondary source; not reconfirmed |
What racquet does Casper Ruud use?
Yonex’s athlete page lists the Yonex EZONE 100. The page adds that “Yonex professional players may play with a customized racquet with different specifications to the model displayed.”
Should an app reading match a pro’s machine setting?
No. Even where a professional’s reference setting is published, a later app reading estimates installed stringbed tension, a different physical state. For Casper there is no confirmed setting at all. Read the reference setting and stringbed estimate distinction, then compare readings with your own fresh-string baseline.
Track your own setup instead of copying a pro
A professional’s equipment is context. Your useful comparison comes from your own racquet history. In String Tension AI, save your frame, string, gauge and reference tension, measure a fresh-string baseline and repeat under similar conditions.
Follow the repeatable measurement workflow and watch tension loss alongside feel and hours played. This does not imply that Casper Ruud uses or endorses String Tension AI.
What this means for a club player
This page does not show a confirmed main reference setting, so there is no professional number to compare against, and you do not need one. Your starting point comes from your own racquet and the string construction you choose.
- Look up your frame’s published range in the racquet tension range table.
- Choose your string construction and playing objective in the starting-tension calculator.
- After restringing, take a fresh-string baseline reading and judge later readings by relative change, alongside feel and hours played.
Casper Ruud string setup FAQ
What strings does Casper Ruud use?
Yonex’s athlete page lists Yonex POLYTOUR SPIN 125 and Yonex POLYTOUR PRO 130. Two strings in one kit points to a hybrid of two polyesters, but the page does not say which string goes in the mains and which in the crosses.
What string tension does Casper Ruud use?
Yonex does not state one, and this profile does not show a tension as his setting. The tension in our catalog row comes from an older secondary source that we have not reconfirmed.
What gauge does Casper Ruud use?
The kit names POLYTOUR SPIN in its 1.25 mm version and POLYTOUR PRO in its 1.30 mm version.
Is Casper’s setup a full bed or a hybrid?
Two strings in one kit points to a hybrid of two polyesters, but the page does not say which string goes in the mains and which in the crosses.
What racquet does Casper Ruud use?
Yonex lists the Yonex EZONE 100. Yonex notes that its professionals may use customized racquets with different specifications.
How does this profile compare with the pro setups table?
On October 3, 2026 we updated our catalog row to the kit: it now lists POLYTOUR SPIN 1.25 mains, POLYTOUR PRO 1.30 crosses and an EZONE 100 racquet record, replacing POLYTOUR PRO 1.25 and a VCORE 98. The kit does not assign mains and crosses, so that orientation and the catalog’s tension still come from the secondary report, not from Yonex.
Should I copy Casper’s setup?
There is no confirmed tension to copy, and a professional’s frame, swing and stringing support differ from yours. Start from your own racquet’s published range and the string construction you choose.
What app reading should match Casper’s setup?
None. There is no confirmed machine setting to use as a target, and a later app reading estimates installed stringbed tension, a different quantity. Compare your readings with your own fresh-string baseline instead.
Sources and methodology
The manufacturer source establishes the listed equipment. It does not state a tension, assign strings to mains and crosses, or give personal frame specifications, so this profile leaves those fields open rather than estimating them. The catalog row is compared field by field. The manufacturer listing is treated as the stronger identification: on October 3, 2026, catalog strings, gauges and racquet records that differed from it were changed to match. Tension, string direction and any gauge the manufacturer does not state still come from the secondary source. See the parent catalog methodology.
The manufacturer source was checked on 2026-10-03. The secondary source shows the date our catalog accessed it; it was not rechecked for this profile. Publication dates are shown only when supplied by the source; an access date is not a claim that an undated page was published that day. No personal racquet was inspected for this profile.
First-party manufacturer evidence
- Yonex: Casper Ruud athlete kit
Lists the Yonex EZONE 100 racquet and two strings, Yonex POLYTOUR SPIN 125 and Yonex POLYTOUR PRO 130. States no string tension and notes that professionals may use customized racquets. Accessed 2026-10-03.
Secondary source behind the catalog row
- Too Many Rackets: Strings and tension used by professional tennis players
Secondary source behind the Casper Ruud row in our 2026 catalog. The date below is the catalog’s access date; the source was not rechecked for this profile, and its tension is not repeated here. Accessed 2026-07-16.
String Tension AI public data
- String catalog: dated numeric snapshot
- Racquet catalog: model context and uncertainty notes
- Editorial evidence and source links
The racquet catalog links a Yonex EZONE 100 record to this player; see the comparison above for how it relates to the manufacturer listing. See the public racquet weight contract for weight basis and source definitions.