Executive Summary
The Diadem Axis 98 is the flagship frame from Diadem Sports — a UAE-headquartered tennis brand that has grown rapidly by combining accessible pricing with genuine performance engineering and a targeted strategy of signing credible tour players rather than chasing global household names.
Key Characteristic: The Axis 98 is a moderately stiff (~68–70 RA) player's frame with a 98 sq in head, 16x19 pattern, and 300g unstrung weight. Its construction uses high-modulus graphite in a design that sits comfortably in the "all-round advanced" category — comparable feel and performance to mid-tier Head Speed or Babolat Pure Strike territory. The 2025 model update refined the beam geometry and improved feel responsiveness.
Key Positioning: Diadem positions the Axis 98 as a performance-first alternative to the major brands — competitive construction at a lower price point, validated by Svitolina's consistent top-20 results. The brand's ecosystem approach (matching Solstice strings) adds coherence for players who want a complete, validated setup.
Performance Profile
The Axis 98 prioritises control and precision. The Axis 100 adds a larger sweet spot and improved power at the cost of some directional precision — a good stepping stone for players transitioning toward the 98.
Performance Comparison: Axis Models
Axis 98 leads in control and stability · Axis 100 leads in power and maneuverability
Model Context
Diadem's Axis line covers three profiles: the control-precise 98, the balanced 100, and a lighter 100L for players who want the Axis identity with reduced weight demands.
Axis 98 (2025)
The tour-level Axis. Svitolina's frame of choice — a smaller head and precise 16x19 pattern favour directional control and feel over outright power. The 2025 update improved beam responsiveness. Best for confident ball-strikers who generate their own pace and need precision to finish points.
Axis 100
A larger head version of the Axis platform. Adds forgiveness and natural power to the Axis 98's control character. The additional head size creates a larger effective sweet spot without significantly changing the frame's feel identity. A natural entry point to the Axis family for players finding the 98 too demanding.
Axis 100L
The lightest Axis variant. Removes 15g to create a more manageable frame for players who need assistance generating swing speed. Preserves the Axis's graphite construction and feel identity. Good choice for transitioning club players who want a premium feel without the physical demands of the full-weight Axis.
Technical Must-Knows
Who Plays With This?
Svitolina is Diadem's most prominent tour representative — her WTA top-20 ranking and multiple title runs during her Diadem tenure provide the brand's most compelling performance validation.
Former world No.3 and consistent top-20 WTA player, Svitolina's defensive counter-punching style — exceptional footwork, high percentage ball-striking, and intelligent court positioning — suits the Axis 98's control-biased feel profile. Uses Diadem Solstice Power 1.25mm for the full ecosystem setup. Her sustained results with Diadem have been the brand's most effective advertisement.
Diadem's approach — signing credible mid-to-top tour players rather than paying for No.1 endorsements — mirrors the strategy used successfully by Tecnifibre and Yonex over the past decade. The brand invests in genuine equipment development rather than marketing, and the Axis 98's real-world performance is the proof. Svitolina is arguably the best-known player to have switched from a major brand and stayed.
String Setup Guide
The Axis 98's ~69 RA stiffness and 98 sq in head place it in moderate-stiffness territory — neither punishing nor overly arm-friendly. String selection follows standard principles for this frame type. Reference range: 50–62 lbs (22.7–28.1 kg).
Quick Start (Most Players)
- Start point (Solstice Power or similar co-poly, 1.25mm): 52–55 lbs (23.6–25 kg) — the 98 sq in head and moderate stiffness produce a predictable, controllable launch at this range.
- For more spin: Try Diadem Solstice Pro (shaped) at 50–53 lbs. The shaped cross-section amplifies the 16x19 pattern's snapback — a notable improvement in topspin production.
- If the ball is flying long: Add 2–3 lbs. The Axis 98's power output is moderate for a ~69 RA frame; large tension adjustments shouldn't be needed.
- Arm comfort: Drop to 50–53 lbs and try a soft co-poly. The ~69 RA is manageable; staying at mid-range tension keeps the feel comfortable over long sessions.
- Svitolina's setup: Solstice Power 1.25mm at approximately 53–55 lbs is the validated tour reference for this frame — a sensible starting point for Axis 98 users.
Pro Reference
| Player | String | Tension | Notes |
|---|---|---|---|
| Elina Svitolina | Diadem Solstice Power 1.25mm | ~53–55 lbs | Full Diadem ecosystem pairing |
Top 3 String Recommendations
Best for: The validated Axis 98 ecosystem pairing — Svitolina's choice and the natural Diadem starting point.
Solstice Power is Diadem's flagship co-poly — designed and tested alongside the Axis frame. It delivers a balanced feel with good tension maintenance and solid spin production from the 16x19 pattern. Not as firm as ALU Power or as soft as Black Code — it occupies a comfortable mid-ground that suits the Axis 98's moderate stiffness well. Players who want to start with a validated, manufacturer-tested setup should begin here.
Best for: Players wanting maximum spin production from the Axis 98's 16x19 pattern within the Diadem ecosystem.
Solstice Pro's shaped cross-section adds significant ball bite versus Solstice Power — a meaningful topspin upgrade for the same frame. The shaped construction amplifies the 16x19's natural snapback, producing heavier, more kicking groundstrokes. Best at slightly lower tension (50–54 lbs) to allow the shaped edges to engage fully. A good upgrade path for Axis 98 users who find Solstice Power's spin output insufficient.
Best for: Players wanting a premium third-party co-poly that adds feel and touch to the Axis 98's control platform.
Head Hawk Touch's elastic, feel-oriented co-poly formula pairs excellently with the Axis 98's moderate stiffness. The string adds a noticeable feel component that Solstice Power's firmer character doesn't emphasise — making it a good choice for Axis 98 users who want more touch and connection at impact, particularly for net play and short-ball approach shots. Excellent tension maintenance for a soft co-poly.
Full Specifications
| Specification | Axis 98 (2025) | Axis 100 | Axis 100L |
|---|---|---|---|
| Head Size | 98 sq in (632 cm²) | 100 sq in (645 cm²) | 100 sq in (645 cm²) |
| Weight (Unstrung) | 300g / 10.6oz | 300g / 10.6oz | 285g / 10.1oz |
| Length | 27 in | 27 in | 27 in |
| Balance | ~318mm / 5–6 pts HL | ~320mm / 5 pts HL | ~325mm / 4 pts HL |
| String Pattern | 16x19 | 16x19 | 16x19 |
| Stiffness (RA) | ~68–70 | ~67–69 | ~66–68 |
| Swingweight | ~315–323 | ~312–320 | ~298–306 |
| Beam Width | 22–24mm | 22–24mm | 22–24mm |
| Technology | HM graphite, 2025 beam update | HM graphite | HM graphite, lightweight |
| Target Player | Advanced (4.5+) | Intermediate–Advanced | Intermediate / Club |