Fischer Tennis USA
   Makers of tennis racquets and equipment.
   http://www.fischertennisusa.com

Matchmaster
   Manufacturer of tennis scoreboards. UK.
   http://www.matchmaster.co.uk

Power Key Company
   Provides an accessory that straighten the strings of racket. USA.
   http://www.straightstrings.com

Silent Partner
   Suppliers of tennis ball machines, stringing machines and strings. Factory-direct sales.
   http://www.sptennis.com

SuperCoach International
   Manufacturer of controlled coaching machine and/or tennis partner to improve game. USA.
   http://www.tennismachine.com/

Yamuna InfoTech
   Analysis software to analyze players performance that provides statistical reports.
   http://www.protennisanalysis.com