Think of what sports you both like and are knowledgeable about and decide what sort of article you wish to make. You can write either a general article about a sports personality or focus on a sporting event or a sportsman or sportswoman in the news.
Research your article thoroughly and display your knowledge to enhance any article. If you are writing an article on a recent sporting event, then you can include a brief history of the event, including when it began, which team or person has been the most successful in the event's history, etc. Show that you have a thorough knowledge throughout your article, without overloading the reader with technical issues. For an article on an individual, then their outstanding achievements should be included, as well as some of the low points of their career.
Write your article in a nonpartisan way. If, in a soccer match, one team has obviously been far superior to its opponent, your article should reflect that, but it should still look for some good aspects of the beaten team's performance. One or two players might have played well on the beaten side, for instance.
Try and get actual quotes from sports personalities. It might seem that many modern sports stars are inaccessible, because they have an entourage surrounding them. However, check social networking sites like Twitter, and see how many sports personalities engage with the general public rather than only fellow celebrities. Always ask permission for using a quote, if you are going to use any response gained in this way. Quotes are often as important as a report, but they should not be distorted.