| Clue | Source | Date |
|---|---|---|
| Contents of a Borg biography? | Wall Street Journal | 20 Jul 2019 |
| Contents of a Borg biography? | ||
| Writings of Nadal, Federer et al.? | USA Today | 25 Feb 2017 |
| Makeup of a 'How to Serve' manual? | Wall Street Journal | 20 Feb 2016 |
| Writings by Venus Williams? |