JI think it might be of help to some to get acquainted with the Fischer Pro Number One in question (I presume it's the 330g version). Since the frame is nearly 25 years old, there is no RacquetFinder profile (as least not an accurate one), so we'll link to the archived TW listing instead:
2001 Fischer Pro Number One
Length: 27" (though it was really 27.3" with a "bubbled" butt cap)
Head Size: 98"
Pattern: 16x20, 8 throat mains
Mold/Beam: Hybrid-Box, constant-taper 25mm-tip to 20mm-neck
Layup: Graphite/Ceramic (though the inclusion of ceramic in this generation is debatable)
Static Weight: 330g unstrung / 346g strung
Swing Weight: ~295 unstrung / ~325 strung
Balance: 31.0cm unstrung (~10pts HL) / 32.0cm strung (~7pts HL)
RA: 65 unstrung
So, we have a 98" player's frame, classic 330g layup, direct/raw/connected feel, mildly-isometric hoop shape, 20-25mm tapered beam with good tip stability, medium-firm flex, good stock plow-through and a nice balance of precision, spin access and forgiveness (for the era, anyways).
As
@McLovin said, the primary issue you're going to have is finding something with similar feel, let alone with other similar specs. There really isn't anything out there today that can replicate all of that together in one frame, so if you can source more from The Bay or elsewhere, that would be my first recommendation. If, for whatever reason, you simply must find a currently-made frame that gets as close as possible, here's what I would look at, all of which will need at least some amount of customization:
Mainstream:
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Babolat Pure Strike 97 - If you value the softer/lower-powered qualities of the Pro One, it may work. Will need handle and hoop weight. Feel is good, although a tad more muted, for sure.
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Dunlop CX 200 2024 - The mild-isometric hoop is the closest in shape of anything made, and the feel, while more muted, isn't that far away. It is way lower in spec, though, so will need extensive customization.
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Dunlop CX 200 Tour 16x19 2024 - In several ways, it's the gem of the silo. Will need less customizing than the regular 200, but still might not be forgiving or thick-beamed enough for your liking.
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Head Radical Pro or MP - The Radical mold will flex differently, for sure, and feel won't be as plush nor direct, but still worth considering. Either the Pro with less customizing, or the MP with more.
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Prince ATS Tour 95 or 98 - A bit more muted, but thicker beamed towards the tip and pretty beefy feeling. I'd recommend a matching service on the 98, as a fair amount of them are over-spec on swing weight.
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ProKennex Black Ace Pro - Might be too soft and/or unforgiving in the same way as the Ultra Pro, and/or you may not get along with the "maracas" sounds, but a very connected feel, worth a try.
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ProKennex Black Ace 300/315 - The 315 is probably the better choice for less customizing needed. Similar to the Pro in terms of feel and general playability, just more forgiving and powerful.
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ProKennex Ki Q+ Tour Pro 315 - An actual 98 from PK, a bit more firm in flex than the Black Ace models, while not being as firm as the Q+ 5's. Definitely worth a try.
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ProKennex Kinetic Pro 5G - With a bit of tip weight, this could be the one from PK that ticks the most boxes.
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Solinco WhiteOut 18x20 - Foam-filled, so a more dampened, but otherwise direct/unfiltered. Offers 5g and 10g weighted butt caps to help with customizing. The 18x20 is also very open, so it spins/lifts more like a 16m.
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Tecnifibre TF40 315 16x19 - Another foam-filled-but-direct alternative. If you can get over the more rectangular grip shape, the TF40 is one of the better-feeling frames out there.
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Volkl C10 Pro - The most pickup-and-play ready in stock form, but will be noticeably more muted/muffled than your Pro One, and sweet spot is lower. Might work, though.
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Wilson Blade v9 98 16x19, maybe 100 - With handle weight (leather grip, etc), will be more muted in feel, but depending on how you have your Pro One's setup, might work.
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Wilson Pro Staff X - The 100" bigger brother of the 97; compared to the Pro One's 98 mildly-isometric shape and where you're at now, it will likely be a better match for you than the 97.
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Wilson Ultra Pro v4 16x19 - Probably the best feel of any hollow-core retail frame made, but will need a good amount of customization, and may still feel too anemic/unforgiving/thin-beamed compared to the Pro One.
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Yonex Percept 97 or 97D - These are borderline, as the feel will be way more muted/muffled. The 97 will need handle + hoop weight; the D won't need anything, but the 18x20 may or may not work for you.
Boutique/Direct-to-Consumer
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Angell TC95/97, maybe 99 - At the 330g/310mm spec, maybe 27.25" length - Foam-filled, so more dampened feel, and a bit more thuddy/clubby than what you're used to with the Pro One, but great frames.
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Angell React Custom MP 99 16x19 - At same spec as the TC - Hollow-core and more aero beam, so faster than the TC's, but not quite as solid or stable in stock form. Could be fixable with light hoop lead.
Left out: Prestige (too different), non-Radical Heads (all too muted), TFights (305 way off, others too open/finicky), RF 01/Pro (too different).
As for
strings, this is where you can potentially make up enough ground to make one or more of the above frames playable enough, by using the absolute
most crisp, lively, responsive options, namely:
- Poly: silver/alu/grey metallic-composite co-poly's will give the most feel/crispness (examples: Luxilon Alu/Rough, Solinco Tour Bite/Soft, Head Hawk Silver, Kirschbaum Max Power/Rough, MSV Bussard)
- Multi: Tecnifibre Multifeel, Signum Pro Micronite
- Multi/Poly Fusion "Multiester": Tecnifibre Triax, Yonex Rexis Speed, Wilson NXT Control
- Syn Gut: Gosen OG Sheep Micro or AK Pro CX, Prince Syn Gut w/ Duraflex Lightning XX, Yonex Dynawire
- Gut: I know you said it's a no-go, but depending on the setup you choose, gut may last longer and cost less over time than certain synthetics in a hybrid; I find Luxilon to be the most crisp
Hope all of that helps. Any questions, feel free.