Additional information: During the next 70 years, tennis as well as any other sport will evolve, so it can offer better performance and entertainment. According to Lacoste, the costume of the tennis player will be redesigned in order to improve aerodynamics and increase the speed of movement. The racquet will be lighter, with a new type of strings and grip to let you hit the ball harder. This one will be also improved to be able to achieve serves twice as fast as todays'. Even the surface is completely changed, but I'll probably be dead by then...

 Related innovations: Maybe other sports like football and basketball will also be improved. Check out this category and you might find the answer.