Manual Exposure Mode
Even though modern digital cameras features advanced algorithms to calculate the right exposure, they still may fail some difficult conditions. Manual exposure mode in these conditions helps a lot in order to achieve correct and consistent exposure. Manual Focus Mode
Compact cameras are not great at focusing moving objects especially at low light and your camera may not even fire bacause of not locking the focus, so manual focus mode is very useful at these times. External Flash Shoe
When shooting indoor sports or outdoor sports at low light, an external flash may become very helpful. RAW shooting capability
RAW files contains much more color information compared to JPEGs, and gives you more room for post processing without significant quality loss. They provide wider dynamic range and option to recover shadow and highlight clipping to some degree.
Average Max shutter speed: 1/2000s
Sigma DP2s's max shutter speed of 1/2000s is not the best in class but it will be enough to freeze the moment. A potential problem may be when you use a fast aperture at very strong light, your camera may overexpose because of slow max shutter speed
Slow Continuous Shooting: 3.0fps
In the world of sports photography, faster is always better. Environmental Sealings
Most outdoor sports games are held in all-weather, so your camera has to be ready for difficult conditions such as rain and snow. Exposure to dust and water splashes are also very common in sports. Focus Points
In sports photography , you keep continuous autofocus (AFC) mode on for tracking the subject and more focus means better tracking. Not so good Ergonomics&Handling
Sigma DP2s\s compact body is not very ideal for sports photography as it lacks the external dials and knobs to change the camera settings fast and the ergonomics doesn't help you to have the most stable shooting position. No Built-in Viewfinder
In the lack of a a viewfinder, holding the camera away from the body while using live view is not very stable, especial with heavy camera bodies and lenses. Besides, LCD screens are very hard to read under bright sunlight. No Image Stabilization
Lack of Image stabilization may result in blurry photos especially at long focal lengths. 41 mm Tele Lens
41 mm reach will not be adequate in many sports events.