| Answer | Crossword Clue |
|---|---|
| SERVES | Starts a tennis point |
| SERVES | Starts the tennis point |
| SERVES | Starts a tennis match |
| SERVES | Starts a tennis game |
| VOLLEYSFORSERVE | Starts a table-tennis match |
| trailhead | the point where a trail starts |
| tautochrone | a curve such that a particle travelling along it under gravity reaches a fixed point in the same time, no matter where it starts |
| tautochrones | TAUTOCHRONE, a curve such that a particle travelling along it under gravity reaches a fixed point in the same time, no matter where it starts |
