Registered: Apr 2008
Location: Bringing forth the apocalypse
No chance whatsoever? Well, it depends on the combatant. He wouldn't have a chance in hell in defeating Bane in combat (his style is completely useless against Bane's orbalisks. Even physically, Bane holds the advantage), nor does he have a chance beating Yoda (smaller, faster, more agile, more percise. Anakin probably couldn't even land a strike on him), nor could he possibly defeat Luke (do I really need to post an argument?). Sidious is likely to be included in this category, too- Sidious is faster and holds an immense psychological advantage over Anakin. However, when it comes to Jacen... I don't know anymore. Does he really have feats that put him firmly above Anakin in saber combat?
He does slaughter a bunch of Vong while cut off from the force. Does this alone put him above Anakin? Not really. But when you consider his incredibly strong connection to the force and his various advantages (ie. pain resistance, invisible in the force), it isn't unreasonable to say Jacen beats Anakin in saber combat.
Plus, "in the zone" Jacen is way better than "in the zone" Anakin.
He starts glowing and melts the Vong overlord. Then he ages five years.
True. However, his mastery of the Force is laughable in comparison to that of Jacen, and he's not even remotely in terms strategizing and fighting efficiently. Plus, Solo's a tank. I've effectively lost count of the ridiculous number of wounds he's suffered in combat, but he fends off Jaina after she blows his arm off and later nearly kills her with a hole in his abdomen. So he's resilient, too.
In a strict lightsaber duel, Jacen wound likely win because he's faster, considerably smarter, and can take hits like no one else but Sion. In an all-out fight, his firmly superior Force abilities would let him make short work of Anakin.