20. Grand Slam
Year Introduced: 1984
There were several incarnations of the Grand Slam over the years, and any are worth seeking out - but the creme of the crop had to be the pegged version released in 1984. There were both high- and lowtop versions, although it seems unlikely that many of the hightops ever saw a tennis court. The peg cushioning didn't last long, but it made its mark.