Pittsburgh Pirates vs Seattle Mariners head-to-head
Who has won more, the Pittsburgh Pirates or the Seattle Mariners?
Seattle Mariners lead the series 18-11 in 29 meetings since Jun 18, 2004. They average 3.8 to 3.9. The last meeting was Jun 25, 2026, 5-1.
- Record
- Pittsburgh Pirates 11-18 Seattle Mariners
- Games
- 29
- Points per game
- 3.8 – 3.9
- Biggest win
- Pittsburgh Pirates by 10
Pittsburgh Pirates have won the last 2 meetings.
Every meeting on file
| Jun 25, 2026 |  SEA at  PIT | 1-5 | Pittsburgh Pirates | Regular |
| Jun 24, 2026 | SEA at PIT | 1-11 | Pittsburgh Pirates | Regular |
| Jun 23, 2026 | SEA at PIT | 3-2 | Seattle Mariners | Regular |
| Jul 6, 2025 | PIT at SEA | 0-1 | Seattle Mariners | Regular |
| Jul 5, 2025 | PIT at SEA | 0-1 | Seattle Mariners | Regular |
| Jul 4, 2025 | PIT at SEA | 0-6 | Seattle Mariners | Regular |
| Aug 18, 2024 | SEA at PIT | 10-3 | Seattle Mariners | Regular |
| Aug 17, 2024 | SEA at PIT | 2-7 | Pittsburgh Pirates | Regular |
| Aug 16, 2024 | SEA at PIT | 3-5 | Pittsburgh Pirates | Regular |
| May 28, 2023 | PIT at SEA | 3-6 | Seattle Mariners | Regular |
| May 27, 2023 | PIT at SEA | 0-5 | Seattle Mariners | Regular |
| May 26, 2023 | PIT at SEA | 11-6 | Pittsburgh Pirates | Regular |
| Sep 19, 2019 | SEA at PIT | 6-5 | Seattle Mariners | Regular |
| Sep 18, 2019 | SEA at PIT | 4-1 | Seattle Mariners | Regular |
| Sep 17, 2019 | SEA at PIT | 6-0 | Seattle Mariners | Regular |
| Jul 27, 2016 | SEA at PIT | 1-10 | Pittsburgh Pirates | Regular |
| Jul 26, 2016 | SEA at PIT | 7-4 | Seattle Mariners | Regular |
| Jun 29, 2016 | PIT at SEA | 8-1 | Pittsburgh Pirates | Regular |
| Jun 28, 2016 | PIT at SEA | 2-5 | Seattle Mariners | Regular |
| Jun 26, 2013 | PIT at SEA | 4-2 | Pittsburgh Pirates | Regular |
| Jun 25, 2013 | PIT at SEA | 9-4 | Pittsburgh Pirates | Regular |
| May 8, 2013 | SEA at PIT | 2-1 | Seattle Mariners | Regular |
| May 7, 2013 | SEA at PIT | 1-4 | Pittsburgh Pirates | Regular |
| Jun 21, 2007 | PIT at SEA | 0-3 | Seattle Mariners | Regular |
| Jun 20, 2007 | PIT at SEA | 0-7 | Seattle Mariners | Regular |
| Jun 19, 2007 | PIT at SEA | 5-3 | Pittsburgh Pirates | Regular |
| Jun 20, 2004 | SEA at PIT | 5-4 | Seattle Mariners | Regular |
| Jun 19, 2004 | SEA at PIT | 5-1 | Seattle Mariners | Regular |
| Jun 18, 2004 | SEA at PIT | 5-4 | Seattle Mariners | Regular |
Completed games on file, which start in 2004 — not the clubs’ full all-time series. Regular season 29, postseason 0.