Honestly, Sasuke is probably equal on Minato.
Sasuke has this under his arsenal
- Mastered Raiton Element
- Mastered Fire Element
- Eternal Mangekyou Sharingan
(Amaterasu, "Blaze Release", Tsykiyomi(A weaker version), and Susano'o)
Minato has
- Kunai he can teleport to
- Wind Element
- Speed
Depending on the environment, and chakra of these characters will determine the fight.
Minato could easily dodge Sasuke's attacks, but Sasuke can easily defend against his opponents attacks.
Sasuke could just activate Susano'o and shoot multiple amaterasu arrows around their battle field, of course Minato can dodge it however Sasuke will spam this until Minato is finally caught.
If not caught, Minato cannot harm Sasuke in his Susano'o state. Why? Because Sasuke will have amaterasu flames covering the Susano'o.
Minato can win if he just puts a seal on Sasuke right when the match begins. If not, he could wait out Susano'o, we all know Minato has the speed. If he can wait out until Sasuke exhausts from Susano'o or just tries his hardest at the beginning. If Minato fought a Sharingan user, we all know he'd go his hardest, he does not underestimate his opponents. He suspected Tobi(Obito) to be Madara Uchiha, or at least strong as the Uchiha leader so he used his flying raijin level 2.
Sasuke owns Minato on the terms that EMS may not allow you to exhaust from Susano'o. Raikage couldn't even take down Sasuke in ribcage state without losing his arm, and if he used the gullotine drop he would've died.
I think Sasuke has this fight.