1. Michael Phelps (Swimming):  With a record-breaking 28 Olympic medals, Phelps is often considered the greatest Olympian of all time.

2. Muhammad Ali (Boxing):  Not only a boxing legend, but also a cultural icon who transcended sports.

3. Babe Ruth (Baseball): Often credited with revolutionizing baseball, Ruth's home run records were unmatched for decades.

4. Jim Brown (Football): Considered one of the greatest running backs, Brown's impact on the NFL was immense.

5. Michael Jordan (Basketball):  His dominance, charisma, and impact on the sport make him a global icon.

6. Carl Lewis (Athletics): Nine Olympic gold medals and world records make him a track and field legend.

7. Serena Williams (Tennis):  One of the most dominant tennis players of all time, with numerous Grand Slam titles.

8. Tiger Woods (Golf): Revolutionized golf with his powerful swing and mental toughness.

9. Wayne Gretzky (Hockey):  Known as "The Great One," he is considered the greatest hockey player of all time.

10. Pelé (Soccer):  While Brazilian, his impact on the global game is undeniable, and he played for the New York Cosmos.

American’s Gold Medal Winner in Summer Olympics Till Date