| Clue | Source | Date |
|---|---|---|
| Type of playing area for tennis (4,5) | ||
| Tennis surface of asphalt or concrete (4,5) | ||
| Paved tennis surface | Eugene Sheffer | 06 Aug 2020 |
| Alternative to grass | New York Times | 26 Aug 2018 |
| GreenSet or DecoTurf product | Newsday | 24 Feb 2018 |
| Alternative to grass |