Ambassador

Noun

1. A diplomat of the highest rank sent to a foreign court to represent there their sovereign or country. (Sometimes called ambassador-in-residence)
2. An official messenger and representative.<!-- material copied from Webster's Revised Unabridged Dictionary (1913) -->
3. A corporate representative, often the public face of the company.

   "As front hall porter, you are an ambassador for the hotel."

4. A player who is an excellent role-model and who upholds the integrity of the game and thereby contributes to the sport's popularity and growth.