Sprint triathlons are a bit unique...they often use a reverse order of legs, compared to longer events. In a typical triathlon, the order of events is swim-bike-run. Many sprint triathlons will be the reverse: run-bike-swim.
Why does this matter? You can adjust your training and pacing appropriately. If swimming is your weakest event and swimming is last, you need to know how to save your strength and strengthen that so you don't hit the wall on this event.