No; of course not! When you play a sport, whether you lose or win does very little compared to how you play and treat others. If you win, and tell another player they did horrible, or bring them down mentally in any way, you are being a poor sport.
The heart is strengthend through cardiovascular exercise.
Long-term physical activity can help to reduce your heart rate through its response to exercise: an increased stroke volume leads to a lower stress response and therefore less cortisol is produced, allowing for a more homeostatic environment for the lymphatic system.