Gray A / Rybakov A - Barry C / Broom C

Current Form and Head-to-Head History
The home team of Alastair Gray and Alex Rybakov kicked off their partnership successfully at the Roehampton Challenger by securing a straight-sets victory (6-0, 6-6 [7-3]) against M. Dhamne and G. Perego in the round of 16. However, analyzing their individual recent records reveals contrasting levels of activity. Alastair Gray has played sparsely in recent months, whereas Alex Rybakov has been heavily active across the Challenger circuit, showing mixed results in singles but standard match fitness. As a newly formed pairing for this tournament, they possess a clean sheet of 1 win and 0 losses. 
The away pairing consisting of Charles Barry and Charles Broom enters this quarterfinal match with slightly higher combined momentum. Seeded 3rd in the tournament, they fought through a challenging round of 16 tiebreaker match against C. Gannon and J. MacKinlay, coming out victorious with a 6-7, 6-3, 12-10 match tiebreak decision. Over their last matches, Charles Broom has shown magnificent individual form on British hard and grass courts, which includes a dominant straight-sets singles win over Rybakov himself just 24 hours prior to this match at this very venue. 
Head-to-Head (H2H): There are no prior professional encounters recorded between these two specific doubles line-ups. However, Charles Broom possesses a fresh psychological edge over Alex Rybakov after defeating him 7-5, 6-3 in the singles round of 16. 
Polymarket
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Injuries and Suspensions: No physical injuries, medical retirements, or technical suspensions are reported for any of the four active competitors. 
Polymarket
Probability Analysis and Market Divergence
The analytical model assigns a narrow edge to the home team with probabilities set at P1 51% / P2 49%. While the model evaluates the individual raw baseline serve and volley metrics highly for Gray and Rybakov, my expert analysis subtly diverges toward the away team, adjusting the baseline valuation to P1 47% / P2 53%.
The reasoning for this variance centers around local conditions, motivation, and fresh head-to-head tape. Charles Broom is playing some of the most consistent tennis of his career on home soil and has established full structural rhythm at the National Tennis Centre. Having already cracked Rybakov’s baseline game in singles on August 19, Broom understands exactly how to attack his opponent's second serve. Coupled with Charles Barry's steady net play, the 3rd-seeded away team exhibits superior synergy under high-pressure deuce points and match tiebreaks compared to the newer Gray/Rybakov tandem. 
LTA
 +3
Additional Markets and Game Totals
Fast, outdoor hardcourt surfaces at Roehampton naturally favor aggressive serving structures, leading to a low variance in broken service games. Both duos feature players with big first serves; Gray and Rybakov hammered 7 aces in their opening match, while Barry and Broom hit 6 aces. 
Wikipedia
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Total Games Forecast: Given the standard ATP Challenger doubles format—where a deciding match tiebreak replaces a traditional third set—the match length typically stays compressed. A line of Under 22.5 Games offers high mathematical utility. A 2-set match finishing 7-5, 6-4 hits the under comfortably, and even a 6-4, 4-6 split going into a 10-point match tiebreak counts as only 21 total games. 
Polymarket
Exact Set Score: The away side is primed to capitalize on Broom's tactical momentum. Expect a tight first set followed by a late break in the second, resulting in a 0:2 victory for Barry/Broom. 
Conclusion and Main Bet
The recommended play is to back the away team based on Broom's superior match fitness and his recent psychological victory over Rybakov on these exact courts. 
If you would like to explore this further, let me know if you want to look at:
The live weather conditions in Roehampton that could affect court speed.
Individual singles fatigue levels for players pulling double duty.
Detailed service hold percentages for Charles Broom this season.