Cincinnati Reds vs Arizona Diamondbacks Picks, Prediction, Odds, and Line Movement for Friday August 21 2026
The Reds vs Diamondbacks prediction for Friday, August 21 features a pair of left-handers at Chase Field, with Cincinnati's Nick Lodolo taking the mound against Arizona's Eduardo Rodriguez at 9:40 PM ET. This matchup pits a Diamondbacks club chasing NL West positioning against a Reds team well out of playoff contention, and bettors looking for more value across the league can check out our full slate of MLB picks before wagering on this one.
TLDR: Quick Picks and Prediction
- Spread Pick: Arizona Diamondbacks -1.5 (+141)
- Total Pick: Under 8.5
- Projected Final Score: Diamondbacks 5, Reds 2
Odds and Line Movement
Current Odds
| Team | Moneyline | Run Line | Total |
|---|---|---|---|
| Arizona Diamondbacks | -152 | -1.5 (+141) | 8.5 |
| Cincinnati Reds | +130 | +1.5 |
Line Movement - Moneyline
| Date | Cincinnati | Arizona | Public ($, #) |
|---|---|---|---|
| 08/20 | +129 | -156 | ARI 86%, 75% |
| 08/20 | +129 | -156 | ARI 92%, 75% |
| 08/20 | +129 | -156 | ARI 93%, 8% |
| 08/20 | +129 | -156 | CIN 92%, 92% |
| 08/20 | +124 | -150 | CIN 92%, 92% |
| 08/20 | +124 | -150 | CIN 92%, 92% |
| 08/20 | +123 | -149 | CIN 92%, 92% |
Line Movement - Total
| Date | Over | Under | Public ($, #) |
|---|---|---|---|
| 08/20 | 8o-119 | 8u-101 | U78%, U67% |
| 08/20 | 8Âœo-102 | 8Âœu-118 | O89%, O56% |
| 08/20 | 8Âœo-104 | 8Âœu-116 | O89%, O56% |
| 08/20 | 8Âœo-105 | 8Âœu-115 | O89%, O56% |
Reds vs Diamondbacks Key Matchups and Game Preview
Arizona's Pitching Advantage
Eduardo Rodriguez gives Arizona a sizable starting-pitching advantage in this matchup, carrying a 12-4 record with a 2.71 ERA and a 1.21 WHIP through 149.1 innings. He has allowed 134 hits while striking out 106 and issuing 47 walks, giving the Diamondbacks a reliable arm capable of controlling this game against a low-average Cincinnati lineup.
Cincinnati's Starting Pitching
Nick Lodolo has been less consistent this season, going 3-2 with a 4.52 ERA and a 1.42 WHIP across 71.2 innings, allowing 73 hits and 12 home runs while recording 57 strikeouts against 29 walks. Lodolo's vulnerability is a significant factor working in Arizona's favor heading into Friday night.
Reds Power Numbers
Cincinnati does possess the stronger power numbers overall, having hit 165 home runs compared with Arizona's 126, though the Reds are batting only .226 as a team with a .305 OBP. Sal Stewart has supplied much of that production with 27 home runs and 96 RBI while batting .259.
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Diamondbacks Offensive Consistency
Arizona has been a more consistent offensive club overall, batting .243 with a .316 OBP. Gabriel Moreno is hitting .307 with a .385 OBP, while Ketel Marte has added 21 home runs and 67 RBI, giving the Diamondbacks a deeper and steadier lineup than Cincinnati's power-driven approach.
De La Cruz's Impact
Elly De La Cruz is also hitting .259 with a .343 OBP and a .467 slugging percentage for Cincinnati, giving the Reds another dangerous bat capable of doing damage even against a strong Arizona starter. His presence makes Cincinnati's home-run ability slightly more relevant than the team batting average alone would suggest.
Reds Bullpen Concerns
Cincinnati is without Spencer Steer, while relievers Tony Santillan and Graham Ashcraft are also sidelined, thinning the bullpen in a game where Lodolo's shorter track record could require earlier relief innings than Arizona will need from its own staff.
Diamondbacks Injury Situation
Arizona has Lourdes Gurriel Jr. on the injured list, while Tommy Troy is unavailable and relievers Ryan Thompson and Drey Jameson have also been dealing with injuries. Despite those absences, the Diamondbacks' rotation strength keeps them the more reliable side in this matchup.
Diamondbacks Recent Form
Arizona enters this game off a 7-6 extra-inning win over Boston and has won two of the first three meetings between these teams this season. That recent form, combined with the Rodriguez-Lodolo pitching gap, supports Arizona as the clear favorite heading into Friday night.
Reds Recent Form
Cincinnati has dropped three of its last five games, continuing a difficult stretch for a club already 18 games behind first-place Milwaukee in the NL Central. That inconsistency adds to the challenge of facing one of the better starters in the National League on the road.
Arizona's Home Field Edge
Playing at Chase Field gives Arizona a natural advantage in this matchup, and combined with Rodriguez's dominant season-long numbers and the club's more consistent offense, the Diamondbacks enter as the significantly stronger side on paper.
Betting Trends: ARI vs CIN
Public bettors have shown mixed signals throughout the week, with Arizona drawing as much as 93% of money at one point on the run line, while Cincinnati later attracted 92% of both money and tickets in several subsequent reports. The run line has moved from Cincinnati +123/Arizona -149 up to the current Cincinnati +129/Arizona -156 number. On the total, the public leaned toward the under early before shifting toward the over, with support reaching as high as 89% of money in more recent reporting windows.
Key Injuries and Things To Know: ARI vs CIN
- Cincinnati is without Spencer Steer, while relievers Tony Santillan and Graham Ashcraft are also sidelined.
- Arizona's Lourdes Gurriel Jr. is on the injured list, and Tommy Troy is unavailable.
- Diamondbacks relievers Ryan Thompson and Drey Jameson have also been dealing with injuries.
- Arizona has won two of the first three meetings between these teams this season.
Reds vs Diamondbacks Side and Over/Under Picks
- Side Pick: Arizona Diamondbacks -1.5 (+141)
- Total Pick: Under 8.5
Cincinnati's home-run ability makes the run line slightly less attractive, but Arizona deserves to be favored behind the superior starter. With Rodriguez capable of limiting a low-average Reds lineup and Lodolo vulnerable enough to allow Arizona to do most of the scoring, the under also offers value at 8.5.
Final Score Prediction
Projected Final Score: Diamondbacks 5, Reds 2
This projection reflects Rodriguez's clear pitching advantage, Arizona's more consistent offensive approach and the Diamondbacks' recent form and home-field edge. Cincinnati's power bats keep the Reds within striking distance, but Arizona's overall roster edge should be enough to control the outcome.
How to Wager On Diamondbacks vs Reds
With public money split between both sides throughout the week, comparing odds across multiple sportsbooks is worthwhile before locking in a number on this game. The total has also shifted from under to over support, making early positioning valuable for bettors weighing both directions of the market.
For additional tools before wagering on this matchup, check out our AI picks for model-based projections, read the Dimers review for a simulation-driven breakdown, or explore the Oddible review for another data-backed take on Diamondbacks vs Reds.
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