Threat to vs threat on vs threat upon vs threat against

1. He is unlikely to be a threat to the Spanish player in the final.

2. He is unlikely to be a threat on the Spanish player in the final.

3. He is unlikely to be a threat upon the Spanish player in the final.

4. He is unlikely to be a threat against the Spanish player in the final.

I wonder which ones are correct English and about the differences in meaning.