What makes the World Championships THE hottest competition of the year is the matchups. The best of the best, gathered in one place to determine the best in the world in each event. In a meet of matchups, one should stand head and shoulders above the rest – the men’s 400 meters. It was the hottest matchup in Rio and fittingly produced the hottest result of the Games – three men under 44.00 and a world record 43.03! Incredibly, in spite of losing one of last year’s medalists to injury, the 400 is once again shaping up as the hottest matchup of the meet. In Rio we were looking at…