The Seattle Mariners' Pitching Philosophy: A Recipe for Success or a Risky Gamble?
The Mariners have a clear vision for their pitching staff, and it's working. But is it sustainable? Let's dive into their unique approach and the intriguing case of Josh Simpson.
The Mariners' Pitching Lab:
In recent seasons, the Seattle Mariners have earned a reputation for transforming pitchers' careers, particularly for journeymen relievers. This success can be attributed to their distinct pitching philosophy and the specific profile they seek in their pitchers. Enter Josh Simpson, who embodies this philosophy.
Editorial Note:
Apologies for the delay in this 40 in 40 series finale. We almost missed one key player! Now, let's explore why Simpson fits the Mariners' mold.
Rule 1: Slider and Sinker Dominance:
To be a Mariner, you must master the slider and sinker. Here's the proof:
- Matt Brash: 61% slider, 22% sinker usage.
- Andrés Muñoz: 50% slider, 12% sinker usage.
- Eduard Bazardo: 43% slider, 41% sinker usage.
- Gabe Speier: 26% slider, 30% sinker usage.
- Carlos Vargas: 19% slider, 63% sinker usage.
- Josh Simpson: 6% slider, 22% sinker usage.
The Mariners' pitchers ranked 6th in slider usage in 2025, throwing it 26% of the time. But they don't rely on one pitch alone. The team also ranked 2nd in sinker usage at 23%. Simpson, while not a slider specialist, throws a 'sweeper' more than any other pitch. This pitch is less popular, but the Mariners have shown restraint, reducing its usage over the years. Simpson's sweeper was highly effective with the Marlins, but he rarely uses his slider, which has a unique shape.
The Sweeper vs. Slider Debate:
Simpson's sweeper usage is intriguing. He primarily uses it against left-handed batters, suggesting a strategic choice. The sweeper and slider have similar wrist motions, but the slider is more versatile. Simpson could potentially unlock his full potential by embracing the Mariners' slider-sinker philosophy.
Rule 2: Attack the Zone:
The Mariners encourage their pitchers to fearlessly attack the strike zone. In 2025, they ranked 3rd in the league for pitches thrown inside the zone (54%). Bryan Woo was second among pitchers with 57% of pitches in the zone. Simpson had a 54% zone percentage, but his walk rate was a concerning 6.46 BB/9. Despite this, the Mariners believe in his willingness to challenge batters.
A Puzzle to Solve:
Simpson's 2025 season with the Marlins was underwhelming, but the Mariners see potential. They aim to refine his approach in their pitching lab, hoping to transform him into a new player.
Rule 3: The Journeyman's Journey:
The Mariners have built their bullpen through trades, waivers, and DFA postings. None of their 2025 relief pitchers were drafted by Seattle, and only Brash debuted with the team. Simpson, acquired from Miami, is a prime example of their strategy. The Mariners excel at giving pitchers a second chance, often with remarkable results.
Simpson's Second Chance:
Despite a questionable past, Simpson's array of secondary pitches and ability to induce ground balls within the zone align with the Mariners' vision. He'll likely refine his skills in Tacoma before returning to Seattle this summer.
Controversy Alert:
Is the Mariners' pitching philosophy a sustainable model, or are they playing with fire? Can Simpson truly embrace their slider-sinker approach, or will he remain a sweeper specialist? Share your thoughts in the comments below! The debate is open, and we want to hear from you.
