Related Clues:
- Starting point
- Court limit
- Runner's route
- Route for some runners
- Tennis server's spot
- Standard of comparison
- Enables one to proceed from starting point
- Black grease drops against end of court
- Headquarters' file shows where to find a serving man
- Marks limit of play on tennis court
- Back of tennis court — standard
- You might run on one to get home
- Foundation gets to underscore this position in court
- Border on the court
- HQ standpoint is the yardstick