Seattle Mariners Win Percentage Charts and Records
About Win Percentage
Win percentage is a metric that shows how often a pitcher wins when they are responsible for a win or a loss. It is calculated by dividing wins by the number of decisions, which is the sum of wins and losses. No decisions are not reflected in win percentage. Generally, for Win Percentage, higher is better. (Source)
Top Seattle Mariners Players by Win Percentage
Which Seattle Mariners players rank highest in Win Percentage? Below are the top ten by single season and by career totals with the team, requiring at least 50 innings pitched for a season record, or 100 innings pitched for a career record with the team.


Seattle Mariners Win Percentage Per Season
Seattle Mariners's Win Percentage for each season of their history, plotted alongside yearly averages for MLB, the American League, and the American League West.

Seattle Mariners Win Percentage Season Distribution vs. MLB and Peers
Each box summarizes Win Percentage across all seasons, comparing the Seattle Mariners to MLB as a whole, the American League, and the American League West. The box covers the middle 50% of seasons, the center line is the median, and the whiskers extend to the min and max values.

Seattle Mariners Win Percentage Year-Over-Year Change
A waterfall chart showing how the Seattle Mariners's Win Percentage shifted season over season. Each bar represents the change from the previous year, making it easy to spot peak and decline phases.

Seattle Mariners Win Percentage — Season-by-Season Breakdown
Every season of Seattle Mariners's history with Win Percentage alongside yearly averages for MLB, the American League, and the American League West. Career totals include sum, average, minimum, maximum, and median.
