First of all , it depends on what sport you like and what sports you follow. Who plays for their self , their team , and their fans the hardest? Personally , Michael Jordan is to me the most loyal player to play ever! Bet you didn't see that one coming haha. He played 1,072 regular season career games , it's not the all time record but think about it. I didn't choose him because of his all time records by far but because how he loved the game , it wasn't a job to him , it was what he was passionate about.
There are plenty of people who show up and give their all to games. Allen Iverson is another person who came out and played every game as it was his last. Just a small personal opinion on who is the most loyal person to play sports. Loyalty is the 1st thing to grow as a person , group , or team. Without it you are stuck in a canoe going upstream with no paddle. There are many great ways to start your day off and discussing who everyone in the world thinks is the most loyal sports player is an awesome way! So if you follow ANY sports leave your opinion for the world to know!