Sasuke's speed and reflexes are far above Hiruzen's, and all of his base ninjutsu is undeniably superior as well. Sasuke's Katons are bigger than Hiruzen's, and Sasuke's multiple Chidori variants can destroy any Doton defense Hiruzen tries to put up. Chidori spear gives Sasuke the luxury of attacking at mid-range as well. Hiruzen is also vulnerable to Sharingan Genjutsu. Barring perhaps Taijutsu skill, Sasuke is superior in every way.
At best, Hiruzen can try forcing a tie via the death god, and that's assuming Sasuke doesn't kill him before he uses that. And even if that succeeds, it isn't exactly a victory either.