Equipment profile · Manufacturer kit
Madison Keys String Tension & Setup
Yonex lists the EZONE 98 and POLYTOUR REV 125, and describes her switch to a Yonex racquet. No tension is published.
By String Tension AI · Published · Research checked
This is a source-based equipment profile, not an official Madison Keys page. It reports what Yonex lists for Madison, compares that listing with our catalog row, and does not fill the missing tension with an estimate.
Yonex’s athlete page lists Madison Keys with the Yonex EZONE 98 racquet and Yonex POLYTOUR REV 125 string. The kit lists one string. That fits a full bed, but the page does not confirm what goes in the crosses. The kit lists the 1.25 mm version of POLYTOUR REV. Yonex states no string tension, and this profile does not show one as her setting: a product listing identifies equipment, not a stringing-machine reference setting. Our catalog row lists POLYTOUR REV 1.25 in the mains, matching the kit’s string and gauge. Its racquet record listed a Wilson Blade 98 v9, an association from before the switch Yonex describes; on October 3, 2026 we changed it to the Yonex EZONE 98 named in the kit.
Evidence: Yonex
Madison Keys’s setup at a glance
- Player
- Madison Keys
- Racquet
- Yonex EZONE 98
- Strings listed
- Yonex POLYTOUR REV 125
- Gauge
- 1.25 mm
- Mains / crosses
- One string listed
- Reference tension
- Not stated by the manufacturer
- Catalog row
- Agrees on string and racquet
- Evidence status
- Manufacturer page, undated
- Research checked
- 2026-10-03
View all 69 sourced pro string setups →
What strings does Madison Keys use?
Yonex POLYTOUR REV 125, as listed on Yonex’s athlete page.
The kit lists one string. That fits a full bed, but the page does not confirm what goes in the crosses. The kit lists the 1.25 mm version of POLYTOUR REV.
What string tension does Madison Keys 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 Madison Keys row in the pro string setups table carries a tension from IQ Tennis, accessed by our catalog on 2026-07-16. We have not reconfirmed it for this profile, so it is not repeated here as her current setting.
How this profile compares with our pro setups table
Our catalog row lists POLYTOUR REV 1.25 in the mains, matching the kit’s string and gauge. Its racquet record listed a Wilson Blade 98 v9, an association from before the switch Yonex describes; on October 3, 2026 we changed it to the Yonex EZONE 98 named in the kit.
Scroll the table sideways to compare all source details.
| Field | Yonex (checked 2026-10-03) | Our catalog row (secondary source: IQ Tennis) |
|---|---|---|
| Racquet | Yonex EZONE 98 | Yonex EZONE 98 |
| Strings | Yonex POLYTOUR REV 125 | Mains: Yonex POLYTOUR REV 1.25 mm · Crosses: Not reported |
| Mains / crosses | One string listed | Cross not reported |
| Tension | Not stated | Listed by the secondary source; not reconfirmed |
What racquet does Madison Keys use?
Yonex’s athlete page lists the Yonex EZONE 98. A manufacturer listing names the model; it does not establish the weight, balance or customization of a professional’s own frame. Yonex’s page says she “quickly adapted after switching to a Yonex racquet”. It does not give a switch date beyond its account of her 2025 season.
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 Madison 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 Madison Keys 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.
Madison Keys string setup FAQ
What strings does Madison Keys use?
Yonex’s athlete page lists Yonex POLYTOUR REV 125. The kit lists one string. That fits a full bed, but the page does not confirm what goes in the crosses.
What string tension does Madison Keys use?
Yonex does not state one, and this profile does not show a tension as her setting. The tension in our catalog row comes from an older secondary source that we have not reconfirmed.
What gauge does Madison Keys use?
The kit lists the 1.25 mm version of POLYTOUR REV.
Is Madison’s setup a full bed or a hybrid?
The kit lists one string. That fits a full bed, but the page does not confirm what goes in the crosses.
What racquet does Madison Keys use?
Yonex lists the Yonex EZONE 98. The listing names the model, not the specifications of a professional’s own frame.
How does this profile compare with the pro setups table?
Our catalog row lists POLYTOUR REV 1.25 in the mains, matching the kit’s string and gauge. Its racquet record listed a Wilson Blade 98 v9, an association from before the switch Yonex describes; on October 3, 2026 we changed it to the Yonex EZONE 98 named in the kit.
Does Madison Keys still use a Wilson racquet?
Not according to Yonex, which lists the EZONE 98 in her kit and describes her switch to a Yonex racquet. Our catalog listed a Wilson Blade until October 3, 2026 and now lists the EZONE 98.
Should I copy Madison’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 Madison’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: Madison Keys athlete kit
Lists the Yonex EZONE 98 racquet and Yonex POLYTOUR REV 125 string. States no string tension. Accessed 2026-10-03.
Secondary source behind the catalog row
- IQ Tennis: ATP and WTA professional equipment database
Secondary source behind the Madison Keys 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 98 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.