Sega Superstars Tennis

Sega Superstars Tennis is a sports video game developed by Sumo Digital and published by Sega. It is the second title in the Sega All-Stars series, preceded by Sega Superstars (2004), and crosses over characters, locations, and soundtracks from several Sega franchises, including Sonic the Hedgehog, Space Channel 5, and Super Monkey Ball. It is the first and only Sega-themed tennis game to represent multiple franchises, and is the first game to feature Alex Kidd (Sega's former mascot) since the release of Alex Kidd in Shinobi World (1990).

After having worked on Virtua Tennis 3, Sumo Digital expressed interest in making a Sega-themed tennis game. Sega Superstars Tennis was officially announced in October 2007 by Sega, and released on 18 March 2008 in North America. It was originally released for PlayStation 3, Xbox 360, PlayStation 2, and Wii, followed by releases for Mac OS X and multiple mobile versions. Upon release, Sega Superstars Tennis received mixed reviews from critics, with reviewers praising the game's Sega-theming and variety of content but criticizing the core gameplay, albeit enjoyable. The game was also praised for including well-received and unique characters, including Ulala from Space Channel 5, and Gum and Beat from Jet Set Radio. The game was later bundled with Xbox 360 consoles in December 2008, alongside the Xbox Live Arcade game compilation. By July 2013, the game had sold more than 5.36 million standalone copies across all platforms, earning it a Guinness World Record for the "Best-Selling Tennis Video Game" of all-time.

The game was followed up by two racing game entries, Sonic & Sega All-Stars Racing (2010) and Sonic & All-Stars Racing Transformed (2012). It was one of the last tennis games developed by Sumo Digital, alongside Virtua Tennis 2009.