| Clue | Source | Date |
|---|---|---|
| Nolan Ryan had seven of them in his career | New York Times | 28 Mar 2025 |
| Pitching rarities | USA Today | 25 Apr 2021 |
| Pitching masterpieces | LA Times Daily | 25 Mar 2019 |
| Pitching masterpieces | The Washington Post | 25 Mar 2019 |
| Pitching masterpieces | ||
| Royal coups? | The Washington Post Sunday | 09 Dec 2018 |
| Baseball rarities | LA Times Daily | 11 Nov 2015 |
| Baseball rarities | ||
| Koufax quartet | ||
| Rarities in baseball. |