To hear Michael Johnson tell it, track is the greatest sport you don't yet know you love. The series, which was unveiled this week, is modeled after tennis' four grand slam events and will open in Kingston, Jamaica, in early April. Not surprisingly, many of the athletes Johnson has recruited to his new circuit agree. Fisher, third in both the 5,000 and 10,000 meters in the Paris Olympics, called Grand Slam Track "the future of the sport." If Johnson's hunch is right, Grand Slam Track might prove to be the way athletes and promoters begin bringing that money — and the fans — back.