Head to Head
| MLB | 2021/09/18 00:10 | SEA Mariners v KC Royals | W | 6-2 |
| MLB | 2021/08/29 20:10 | KC Royals v SEA Mariners | W | 3-4 |
| MLB | 2021/08/28 20:10 | KC Royals v SEA Mariners | L | 4-2 |
| MLB | 2021/08/28 02:10 | KC Royals v SEA Mariners | L | 8-7 |
| MLB | 2021/08/27 02:10 | KC Royals v SEA Mariners | L | 6-4 |
| MLB Exhibition | 2021/03/17 01:05 | SEA Mariners v KC Royals | W | 13-0 |
| MLB Spring Training | 2021/03/09 20:10 | KC Royals v SEA Mariners | W | 3-6 |
| MLB Exhibition | 2020/02/29 20:10 | KC Royals v SEA Mariners | L | 9-6 |
Home History
| MLB | 2021/09/18 00:10 | SEA Mariners v KC Royals | W | 6-2 |
| MLB | 2021/09/15 20:10 | BOS Red Sox v SEA Mariners | L | 9-4 |
| MLB | 2021/09/15 02:10 | BOS Red Sox v SEA Mariners | L | 8-4 |
| MLB | 2021/09/14 02:10 | BOS Red Sox v SEA Mariners | W | 4-5 |
| MLB | 2021/09/12 20:10 | ARI Diamondbacks v SEA Mariners | L | 5-4 |
| MLB | 2021/09/12 01:10 | ARI Diamondbacks v SEA Mariners | L | 7-3 |
| MLB | 2021/09/11 02:10 | ARI Diamondbacks v SEA Mariners | W | 4-5 |
| MLB | 2021/09/08 18:10 | SEA Mariners v HOU Astros | W | 8-5 |
Away History
| MLB | 2021/09/18 00:10 | SEA Mariners v KC Royals | L | 6-2 |
| MLB | 2021/09/16 18:10 | OAK Athletics v KC Royals | L | 7-2 |
| MLB | 2021/09/16 00:10 | OAK Athletics v KC Royals | L | 12-10 |
| MLB | 2021/09/15 00:10 | OAK Athletics v KC Royals | W | 7-10 |
| MLB | 2021/09/12 18:10 | KC Royals v MIN Twins | W | 5-3 |
| MLB | 2021/09/11 23:10 | KC Royals v MIN Twins | L | 2-9 |
| MLB | 2021/09/11 00:10 | KC Royals v MIN Twins | W | 6-4 |
| MLB | 2021/09/09 23:05 | KC Royals v BAL Orioles | W | 6-0 |