Today at 18:00 in round 1 of the men’s tennis tournament at the US Open, Leonardo Mayer of Argentina will face Roger Federer of Switzerland. A single direct confrontation took place between the two players last year in the tournament in Shanghai, where Federer defeated on Leonardo Mayer in three sets on. Leonardo Mayer was eliminated in the first round in Cincinnati, while the other side, Roger Federer won the tournament, defeating in the final world number 1, Novak Djokovic. The difference in the ATP rankings between the two players is quite high, Leonardo Mayer ranking 34 while Roger Federer is No. 2.