Cubs vs. Mariners: MLB Prediction & Analysis

Our detailed prediction and analysis for the Cubs vs. Mariners MLB game on Friday, August 21, 2026 is featured below. Drawing from 10,000 game simulations, we provide expert picks, betting odds, and insights.
FINAL
MLB
FINAL
MLB sport icon
MLB
Cubs
Matthew Boyd 8-2, 4.02 ERA
5
6
T-Mobile Park
Mariners
Emerson Hancock 7-7, 3.31 ERA
T-Mobile Park
2 3 4 5 6 7 8 9 10 RHE
Cubs
0 0 0 0 0 0 1 1 0 5 12 1
Mariners
4 0 0 1 0 0 0 0 1 6 8 2
Live Probabilities
Win %
  • Cubs
    0%
  • Mariners
    100%
Win Probability
Baseball infield diamond diagram
Last At Bat
Outs
Leo Rivas singles to center field. Josh Naylor to second. Randy Arozarena scores.
Quick Box Score
Cubs Hitting
No.PlayerPosABRHRBIHRBBSOAVGOPS
1 P. Crow-Armstrong CF4111100.2501.400
2 S. Suzuki RF5010003.2000.400
3 M. Busch 1B5120002.4001.200
4 A. Bregman 3B5233201.6002.400
5 I. Happ LF5121103.4001.600
6 N. Hoerner SS5010000.2000.400
7 P. Ramirez 2B4000010.0000.200
8 M. Conforto DH4000001.0000.200
9 C. Kelly C5020001.4000.800
Mariners Hitting
No.PlayerPosABRHRBIHRBBSOAVGOPS
1 B. Donovan 3B5021000.4000.800
2 R. Arozarena LF5111001.2000.400
3 V. Robles RF0000000.0000.000
4 J. Rodríguez CF5010002.2000.400
5 J. Naylor 1B4110000.2500.650
6 L. Rivas DH10110001.0002.000
7 C. Raleigh C4113100.2501.250
8 C. Young 2B3110011.3330.833
9 B. Rodden SS4100000.0000.000

Cubs vs. Mariners: Detailed Breakdown

Matchup overview: MLB Friday

  • Teams: CHI Cubs Cubs vs. Seattle Mariners
  • Date: Friday, August 21, 2026
  • Time: 10:10PM ET
  • Venue: T-Mobile Park

Current betting odds

  • Spread: Cubs (+1.5, -220), Mariners (-1.5, +180)
  • Moneyline: Cubs +104, Mariners -102
  • Total (Over/Under): 7.5 runs (-106/+105)

Dimers’ win probabilities

  • Cubs: 47.8%
  • Mariners: 52.2%

Dimers' predictive MLB model, renowned for its accuracy, assesses each team's chances by simulating the outcome of the game 10,000 times. This method provides a precise and unbiased view.

Our Prediction: Who Wins?

After extensive simulations, our model gives the Cubs a win probability of 47.8%, while the Mariners have a win probability of 52.2%.

Summary

According to our analysis, the Mariners are more likely to beat the Cubs in the MLB game at T-Mobile Park on Friday. Discover the best run line, over/under and moneyline odds, picks and probabilities for the game on this page.

Our Cubs vs. Mariners predictions, based on sophisticated simulations and current data, guide you in making informed decisions. Remember to bet responsibly and within your financial limits.

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