Reds vs Mariners Prediction, Picks, Best Bets & Parlay
Free MLB prediction and picks for Tuesday, July 21, 2026 · powered by DataStreak
Reds vs Mariners Prediction
Reds vs Mariners on the slate. The angles below are where the value sits.
The matchup data is what it is. The prop board is where the actual market inefficiency hides.
Reds vs Mariners Picks
No qualifying streaks today for CIN or SEA. DataStreak surfaces picks where a player has at least a 5-game streak at 70%+ hit rate over a 20-game sample - neither roster has a player meeting that bar right now. Common on slow nights or matchups between cold teams; check back tomorrow. See all of today’s free picks across the slate.
Injury Report
15 listed- 10-Day-IlDane Myers
- Day-To-DayChase Burns
- 60-Day-IlGraham Ashcraft
- 60-Day-IlBrandon Williamson
- 10-Day-IlBlake Dunn
- 15-Day-IlTony Santillan
- 15-Day-IlNick Lodolo
- 10-Day-IlMatt McLain
- 7-Day IlJulio Rodriguez
- 15-Day-IlMatt Brash
- 60-Day-IlCarlos Vargas
- 60-Day-IlCooper Criswell
- 10-Day-IlRob Refsnyder
- Day-To-DayEmerson Hancock
- 10-Day-IlBrendan Donovan
Team Trends
- • Cincinnati Reds 24-26 ATS at home this season
- • Cincinnati Reds 35-31 ATS as an underdog
- Season ATS
- 50-45 ATS
- L10 ATS
- 5-5 L10 ATS
- L5 ATS
- 3-2 L5 ATS
- Home ATS
- 24-26 home ATS
- Road ATS
- 26-19 road ATS
- As Fav
- 15-13 ATS as favorite
- As Dog
- 35-31 ATS as dog
- L10 O/U
- 0-0 O/U
- L10 SU
- 0-0
- • Failed to cover in 7 of last 10 games
- • Seattle Mariners 19-28 ATS at home this season
- • Seattle Mariners 17-33 ATS on the road this season
- • Seattle Mariners 31-51 ATS as a favorite this season
- Season ATS
- 36-61 ATS
- L10 ATS
- 3-7 L10 ATS
- L5 ATS
- 1-4 L5 ATS
- Home ATS
- 19-28 home ATS
- Road ATS
- 17-33 road ATS
- As Fav
- 31-51 ATS as favorite
- As Dog
- 3-10 ATS as dog
- L10 O/U
- 0-0 O/U
- L10 SU
- 0-0
Head-to-Head
SEA 4-1 over CIN
| Date | Matchup | Score | Winner |
|---|---|---|---|
| 2025-04-17 | SEA @ CIN | 11–7 | SEA |
| 2025-04-16 | SEA @ CIN | 5–3 | SEA |
| 2025-04-15 | SEA @ CIN | 4–8 | CIN |
| 2024-04-17 | CIN @ SEA | 1–5 | SEA |
| 2024-04-17 | CIN @ SEA | 1–3 | SEA |
Picks, parlays, injuries, trends, and matchup context powered by DataStreak.
The Final Word
The picks below have streaks behind them and odds attached to them. That's all we need.
Reds vs Mariners FAQ
Where can I find free Reds vs Mariners picks for Tuesday, July 21, 2026?
Today's algorithmic plays didn't include Reds vs Mariners, but our full free MLB picks page covers every matchup that did clear the quality bar.
What's the prediction for Reds vs Mariners?
Our prediction is built from team form (records, recent results, win/loss streaks), live moneyline and spread odds across major US books, and DataStreak's algorithmic player-prop research. Every claim on this page is data-backed — no hot takes.
Are these Reds vs Mariners best bets really free?
Yes. Every prediction, pick, and parlay on this page is free, no signup, no paywall.
How is The Cover different from Covers, ATS, or pay-for-pick services?
Three things. (1) Free, full stop — every page, every day. (2) Picks are algorithmic with transparent quality bars (8+ game streak, 75%+ hit rate over 20 games), not opinion columns. (3) Modern UX: live odds, push notifications, comments, mobile-first PWA install.