The U.S Open Tennis Championship started on Monday Aug. 19 and is scheduled to end on Sept. 8. This championship hold tournaments in men’s and women’s singles, men’s and women’s doubles, and mixed doubles. 

The Association of Tennis Professionals(ATP) has a ranking system to determine the ranking in men’s tennis. The ATP has used a computerized points system to determine the rankings since 1973, and as of 1979 the rankings are updated at the beginning of every week. 

Based on these rankings, Novak Djokovic is the No. 1 ranked men’s tennis player in men’s singles. But based on Sunday’s match that could change. Djokovic is 3,740 points ahead of Rafael Nadal, the No. 2 ranked men’s tennis player. 

On Aug. 28, Djokovic had a match against Juan Londero which resulted in a win for Djokovic. After the match and between sets, Djokovic could be seen visiting the trainer; after the match, he told reporters that his shoulder had been bothering him, but he was able to push through the pain. 

On Sunday, Sept. 1, the pain was too much resulting in a retirement of the match between Djokovic and Stan Wawrinka. Djokovic gave up his U.S Open title by retiring his fourth round match. 

Many people who bought tickets to see the match between Djokovic and Wawrinka were furious because the tickets were not cheap. These fans booed Djokovic as he walked off the court on Sunday, Sept. 1.