Seattle Mariners vs Kansas City Royals Prediction & Picks - MLB

USA - MLB

Seattle Mariners
9/16/25 19:40
Kansas City Royals

Prediction:

 

The Mariners -1.5 Runs

+118
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 by Lou Aguila in MLB Picks

The Seattle Mariners will try to push their win streak to 10 games as they gear up for a rough opener against the Kansas City Royals on Tuesday at Kaufmann Stadium.

The Mariners, who have won by at least two runs in seven of their last nine victories, are booked at +118 to cover -1.5 runs in Game 1.

Current Form:

The Mariners (82-68) are on a roll, winning their last 9 games – including sweeps over the St. Louis Cardinals and the LA Angeles. Thanks to this hot run, Seattle has overtaken the Houston Astros (82-69) by 0.5 games for the No.1 spot in the AL West. Cal Raleigh continues to make a case for the AL MVP after raising his home run tally to 54 runs. Jorge Polanco has also delivered the goods in the last 10 games, going 15 for 38 at the plate with nine RBIs and one homer.

The Royals ended their three-game losing streak on Sunday with a 10-3 win over the Philadelphia Phillies. Kansas City returned to .500 with a 75-75 slate, though they are now 3.5 games off a wild-card spot in the American League. Vinnie Pasquantino has driven right runs on 14 for 39 batting over the last 10 games.

Seattle Mariners vs Kansas City Royals Form

Table

Teams % P W L
8
Seattle Mariners
Seattle Mariners
0.547 150 82 68
16
Kansas City Royals
Kansas City Royals
0.5 150 75 75

Seattle Mariners and Kansas City Royals Latest Matches

Seattle Mariners
Seattle Mariners Latest matches
W W W W W W
Victories

6/6 (100%)

Defeats

0/6 (0%)

Sep 14, 2025 - MLB

Los Angeles Angels
2 :  11
Seattle Mariners

Sep 13, 2025 - MLB

Los Angeles Angels
3 :  5
Seattle Mariners

Sep 12, 2025 - MLB

Los Angeles Angels
1 :  2
Seattle Mariners

Sep 11, 2025 - MLB

Los Angeles Angels
6 :  7
Seattle Mariners

Sep 10, 2025 - MLB

St. Louis Cardinals
2 :  4
Seattle Mariners

Sep 9, 2025 - MLB

St. Louis Cardinals
3 :  5
Seattle Mariners
W W W W W W
Victories

6/6 (100%)

Defeats

0/6 (0%)

Sep 14, 2025 - MLB

Los Angeles Angels
2 :  11
Seattle Mariners

Sep 13, 2025 - MLB

Los Angeles Angels
3 :  5
Seattle Mariners

Sep 12, 2025 - MLB

Los Angeles Angels
1 :  2
Seattle Mariners

Sep 11, 2025 - MLB

Los Angeles Angels
6 :  7
Seattle Mariners

Sep 10, 2025 - MLB

St. Louis Cardinals
2 :  4
Seattle Mariners

Sep 9, 2025 - MLB

St. Louis Cardinals
3 :  5
Seattle Mariners
L L L L W W
Victories

2/6 (33%)

Defeats

4/6 (67%)

Sep 7, 2025 - MLB

Seattle Mariners
18 :  2
Atlanta Braves

Sep 6, 2025 - MLB

Seattle Mariners
10 :  2
Atlanta Braves

Sep 5, 2025 - MLB

Seattle Mariners
1 :  4
Atlanta Braves

Sep 3, 2025 - MLB

Seattle Mariners
4 :  9
Tampa Bay Rays

Sep 2, 2025 - MLB

Seattle Mariners
5 :  6
Tampa Bay Rays

Sep 1, 2025 - MLB

Seattle Mariners
2 :  10
Tampa Bay Rays
Kansas City Royals
Kansas City Royals Latest matches
L W L L L W
Victories

2/6 (33%)

Defeats

4/6 (67%)

Sep 14, 2025 - MLB

Kansas City Royals
10 :  3
Philadelphia Phillies

Sep 13, 2025 - MLB

Kansas City Royals
6 :  8
Philadelphia Phillies

Sep 12, 2025 - MLB

Kansas City Royals
2 :  8
Philadelphia Phillies

Sep 11, 2025 - MLB

Kansas City Royals
2 :  3
Cleveland Guardians

Sep 10, 2025 - MLB

Kansas City Royals
4 :  3
Cleveland Guardians

Sep 9, 2025 - MLB

Kansas City Royals
0 :  2
Cleveland Guardians
L L W W W L
Victories

3/6 (50%)

Defeats

3/6 (50%)

Sep 7, 2025 - MLB

Minnesota Twins
5 :  1
Kansas City Royals

Sep 6, 2025 - MLB

Minnesota Twins
2 :  11
Kansas City Royals

Sep 5, 2025 - MLB

Minnesota Twins
1 :  2
Kansas City Royals

Sep 4, 2025 - MLB

Los Angeles Angels
3 :  4
Kansas City Royals

Sep 3, 2025 - MLB

Los Angeles Angels
4 :  3
Kansas City Royals

Sep 2, 2025 - MLB

Los Angeles Angels
5 :  1
Kansas City Royals
L W L L L W
Victories

2/6 (33%)

Defeats

4/6 (67%)

Sep 14, 2025 - MLB

Kansas City Royals
10 :  3
Philadelphia Phillies

Sep 13, 2025 - MLB

Kansas City Royals
6 :  8
Philadelphia Phillies

Sep 12, 2025 - MLB

Kansas City Royals
2 :  8
Philadelphia Phillies

Sep 11, 2025 - MLB

Kansas City Royals
2 :  3
Cleveland Guardians

Sep 10, 2025 - MLB

Kansas City Royals
4 :  3
Cleveland Guardians

Sep 9, 2025 - MLB

Kansas City Royals
0 :  2
Cleveland Guardians

Seattle Mariners against Kansas City Royals : Head to Head (H2H)

Seattle Mariners

33 %

Kansas City Royals

67 %

Jul 3, 2025 - MLB

Kansas City Royals
3 :  2
Seattle Mariners

Jul 2, 2025 - MLB

Kansas City Royals
2 :  3
Seattle Mariners

Jul 1, 2025 - MLB

Kansas City Royals
6 :  3
Seattle Mariners

Jun 30, 2025 - MLB

Kansas City Royals
2 :  6
Seattle Mariners

Mar 21, 2025 - MLB Spring Training

Seattle Mariners
7 :  8
Kansas City Royals

Mar 12, 2025 - MLB Spring Training

Kansas City Royals
7 :  6
Seattle Mariners

Seattle Mariners - Kansas City Royals Key Points

  1. Kansas City is 2-6 SU in its last 8 games.
  2. Kansas City is 1-4 SU in its last 5 games against an opponent in the American League.
  3. Seattle is 9-0 SU in its last 9 games.
  4. Seattle is 11-5 SU in its last 16 games against Kansas City.

Our Seattle Mariners vs Kansas City Royals Prediction

Expect the Mariners to sustain their red-hot form by routing the Royals for their 10th straight win. Seattle is 11-5 in its last 16 games against Kansas City. The Mariners have sported an impeccable 2.16 ERA over their last 10 games, while averaging 6.7 runs per game on a .273 BA in the stretch. Logan Gilbert hasn’t allowed more than one run in his last two starts. Gilbert surrendered one earned run and struck out seven over 4.2 innings in his last start versus the Royals on July 2.

Meanwhile, the Royals are 2-6 in their last eight games, though seven of these games were against wild card contenders Cleveland Guardians, and NL East leaders, the Philadelphia Phillies. Projected starter Michael Wacha is coming off a solid mound appearance against Minnesota on September 5, allowing one earned run and four hits over 5.2 innings. The problem for Kansas City lies in its bullpen, which has surrendered a 5.12 ERA in the last five games. The Royals have also averaged 3.6 runs per game in their last three meetings with the Mariners.

Our betting prediction for the Kansas City Royals vs. the Seattle Mariners: the Mariners -1.5 Runs

Prediction:

 

The Mariners -1.5 Runs

+118
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Seattle Mariners vs Kansas City Royals Picks