The following games are tagged with tennis

Andre Agassi Tennis
Sega Game Gear
Tecmagik

Davis Cup Tennis
Sega Genesis
Tengen

Grand Slam
TI99/4A
B. J. Flynn

International 3D Tennis
Spectrum 48K/128K
Palace

International Tennis
Spectrum 48K/128K/+2/+3
Zeppelin Games

Konami's Tennis
Spectrum 48K/128K/+2/+3
Imagine

Passing Shot
Spectrum 48K/128K/+2
Image Works

Pro Tennis Simulator
Spectrum 48K/128K
Codemasters

Pro Tennis Tour
Spectrum 48K/128K/+2/+3
Ubisoft

Pro Tennis Tour: Great Courts
Amstrad CPC 464+/GX4000
Ubisoft

Sampras Tennis 96
Sega Mega Drive (EU Version)
Sega

Speccy Pong
Spectrum 48K/128K/+2/+3
Julian Munoz

Tennis
Game Boy Advance
Nintendo

Tie-Break
Commodore 64
Starbyte

Virtua Tennis
Dreamcast (US Version)
Sega

Wimbledon
Commodore 16
Gremlin Graphics