| Abbreviation | Definition |
|---|---|
| MRTA | Macedon Ranges Tennis Association |
| MSTA | McLean Swimming and Tennis Association |
| MTEF | Milwaukee Tennis and Education Foundation |
| MTF | MensTennisForums.com |
| MTPS | Master Tennis Performance Specialist |
| MTRC | Manchester Tennis |
| MTTA | Manitoba Table Tennis Association |
| MTUS | Mario Tennis Ultra Smash |
| MWTC | Meadowvale West Tennis Club |
| NATT | North American Table Tennis |
| NBTC | Newport Beach Tennis Club |
| NGT | Next Generation Tennis |
| NMG | Net Match Game |
| NPRC | Needham Pool and Racket Club |
| NRSTC | North River Shores Tennis Club |
| NRTC | North Ringwood Tennis Club (North Ringwood, VIC Australia) |
| NSTC | Nashua Swim and Tennis Club |
| NSTL | North Somerset Tennis League |
| NTA | National Tennis Academy |
| NTC | National Tennis |