Sports courts that use asphalt-based materials need regular resurfacing every few years. While this is a normal part of long-term maintenance, and you can't stop the surface of a court from deteriorating at all, you can take steps to preserve the latest resurfacing job. The surface of the court receives quite a beating every time people play on it, so it's expected that eventually you'll see wear no matter what you do. But you can still prolong the time in between resurfacing jobs.
Patch Cracks Immediately
Like the asphalt on driveways and roads, the surface of a softer athletic court is prone to water seepage and cracks from frost. When those cracks open up, you need to patch them immediately. You don't have to resurface the whole court, but seal up any openings. If you leave the cracks open, all that will happen is that more water will seep in and either erode the underlying material or freeze and cause further cracks.
Applying the sealing material is easy -- you only have to ensure that you cover the cracks completely. Keep inspecting the court for more cracks and seal as needed.
Sometimes it's not a crack but bad drainage that does the court surface in. You can find what are charmingly called birdbaths, or low depressions in the surface that hold water. Even if water has not gotten through the court surface, poor drainage and base preparation under the court can cause the soil to shift, creating these dips. No matter how much you resurface, if the base is in bad shape and the drainage isn't working properly, you're going to end up with more of these birdbaths.
Consider Different Surface Paint
One of the leading causes of cracking due to thermal expansion is the different surface temperatures between dark and light court surfaces. If you have a white line painted on a dark green court, for example, the dark green portion is going to absorb more heat and expand more. The lighter portion won't expand as much, so it won't move along with the darker portion. That causes a crack to open in the lighter portion. To solve this, try using a lighter court base color. You may have to use white or yellow lines per sports regulations, but the court itself can be a different color. A lighter one reduces the amount of movement due to thermal expansion.
If it turns out you do have to resurface again early, have the company inspect the existing surface to pinpoint exactly what happened to cause the problem. That way, you can get that fixed before court resurfacing.