Since the Greek gods and goddesses were from long ago there is no Greek god or goddess of sports but if meaning like the Olympics it would be Zeus because, the Olympics were dedicated to him.
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Nike is the Greek goddess victory and the one that many consider to be the Greek Goddess of sports.
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In Roman mythology, he is the blacksmith god, or the god of the forges.
cupid is a roman god
The Roman god Janus, was god of gates, doors, and beginnings and endings.
He is Greek god, but he does have a roman version Jupiter
The Roman equivalent to the Greek god Hermes is the Roman god Mercury.