Compared to almost all other team sports, baseball is unique in that it is not played against a clock.
Comparing almost all other team sports, baseball is unique in that it is not played against a clock.
Compared to almost all other team sports, baseball is unique in that it is not played against a clock.
Comparing almost all other team sports, baseball is unique in that it is not played against a clock.
In a comparison of one item to another, the correct idioms are "compared to A, B" or "compared with A, B." This sentence compares baseball to other team sports, so the choice that begins with "Compared to..." is correct.