| Abbreviation | Definition |
|---|---|
| CSOT | Canberra School of Tennis |
| CTA | Colorado Tennis Association |
| CTC | Canadian Tennis Centre |
| CTPS | Certified Tennis Performance Specialist |
| CTTA | Central Texas Tennis Association |
| CTTA | Cheltenham Table Tennis Association |
| CTTA | Chinese Table Tennis Association |
| CTTD | Club de Tennis de Table de Dammartin |
| CVTA | Centennial Valley Tennis Association |
| CVTA | Concho Valley Tennis Association |
| CVTA | Coosa Valley Tennis Association |
| CVTC | Carmel Valley Tennis Camp |
| CYTL | Corona Youth Tennis League |
| DBLS | Doubles |
| DCTA | Dearborn Community Tennis Association |
| DDTA | Dandenong District Tennis Association |
| DLTC | Drachtster Lawn Tennis Club |
| DLTC | Dublin Lawn Tennis Council |
| DMTP | Dream Match Tennis Pro |
| DMTT | Dan Maskell Tennis Trust |