Some managers believe the best way to be fair is to treat everyone the same, and they are concerned if they accommodate you, they will have to do the same for everyone.
To combat this, you need to make sure your request is framed as a business request, not as a personal favor or family accommodation. For example, you can explain that working from home on Fridays would save a two-hour commute that you could otherwise spend working, and working from home would allow more uninterrupted time to work on tasks requiring long stretches of concentration (as opposed to being distracted by the comings and goings of the busy office). This is a better request than saying how telecommuting will help you go to more soccer games.
You should also document all aspects of your request. By doing so, you are providing your supervisor a format by which they can decide whether or not to grant requests from other employees by applying the same decision-making rules. You’re helping them make more fair and consistent decisions.