The Athletics (12-11) face the Seattle Mariners (10-14) on Tuesday, April 21, 2026 at 9:40 PM ET on Regional Sports Network. Jacob Lopez takes the mound against Luis Castillo. Our model gives Athletics a 59% edge.
Quick Facts
| Matchup | Athletics at Seattle Mariners |
| Date | Tuesday, April 21, 2026 |
| First Pitch | 9:40 PM ET |
| Venue | T-Mobile Park |
| TV | Check local listings / MLB.TV |
| Streaming | MLB.TV |
| Probable Pitchers | Jacob Lopez vs Luis Castillo |
Where to Watch ATH vs SEA
The Athletics visit the Seattle Mariners on Tuesday, April 21, 2026 with first pitch at 9:40 PM ET. The game will air on Regional Sports Network and can be streamed on MLB.TV.
Pitching Matchup
Jacob Lopez takes the mound for the Athletics against Luis Castillo for the Seattle Mariners.
Matchup Analysis
The Athletics (12-11) have a 59% win probability in our model.
The Seattle Mariners (10-14) are given a 41% chance with home field advantage.
This is an AL West divisional matchup with direct implications for the division standings.
Head-to-Head
Season Series
Tied 1-1L 4-6 vs SEA (Mar 20)W 6-4 @ SEA (Apr 21)
Recent Form
Athletics — Last 5 Games
2-3 · Streak: W1W 6-4 @ Seattle MarinersApr 21
L 4-7 vs Chicago White SoxApr 19
W 7-6 vs Chicago White SoxApr 18
L 2-9 vs Chicago White SoxApr 18
L 6-9 vs Texas RangersApr 16
Seattle Mariners — Last 5 Games
2-3 · Streak: L1L 4-6 vs AthleticsApr 21
W 5-2 vs Texas RangersApr 19
W 7-3 vs Texas RangersApr 18
L 0-5 vs Texas RangersApr 18
L 2-5 @ San Diego PadresApr 17
See live scores: MLB Scores