There does exist a sport in which disabled and nondisabled athletes compete side-by-side-- literally. "One-up/one down" tennis is a form of mixed doubles with teams made up of one player in a chair and one not. Wheelchair tennis per se runs by virtually the same rules as the Sampras/Navratilova kind; you can, however, let the ball bounce twice before hitting it. As Vicki Turner of the National Foundation of Wheelchair Tennis puts it, "the wheelchair player obviously gets the second bounce, which can enable him, depending on his level of skill, to compete with an able-bodied player." The one-up/one-down game, then, requires only a modest adjustment for either player-- and it's a hybrid event that stands as an object lesson in how to truly integrate a sport.
Admittedly, the one-up/one-down game was easy to add to the tennis repertoire because tennis isn't a team sport and isn't always a one-on-one sport, either, both of which raise tricky issues of player penalties and advantages. But while International Paralympic Committee president Robert Steadward worries that "inclusion" of able-bodied players in disabled sport in general means fewer slots for actual disabled people, he fully approves of one-up/one-down tennis: "You're talking about a method of rehabilitation that does not remove the [advantage] of the person with a disability.... I really think that what tennis has done is great."