Abhimanyu: The best of Warriors
Mahabharata Drona Parv Ch 33-50

On 11th and 12th Day of war Drona have been trying to capture Yuddhisthir but Couldn't do it because of Arjun.

So on 13th Day, Drona pledged to kill anyone Pandav Maharathi and he created Chakra Vyuha.

Arjun was distracted & taken away by Sanshaptakas.

When Pandavas came to know about Chakra Vyuha, Abhimanyu told that he knows how to enter the Vyuha but doesn't know the outlet. Yuddhisthir told him that he along with other warriors will follow him into the Vyuha.

Abhimanyu started at the Gate and defeated Drona along with his army.

Some of major accomplishments on the day were:

1. He slayed son of Ashmak and brother of Shalya.

2. Made Shalya unconscious.

3. Defeated Dushashan and Karna.
(Karna was defeated even by Abhimanyu leave Arjun aside.)

4. He Slayed brother of Karna.
5. He slayed Satyashrava, Rukmarath and other Prince warriors.
6. Defeated Duryodhana.
7. He Slayed Laxman and Son of Krath.

8. He slayed Brihadwal(King of Koshal) and other kings.

9. Defeated 6 Maharathi warriors including Drona, Kripa, Ashwasthama, Karna, Kritvarma at once

10. He Slayed Ashwaketu and Bhoj and defeated Karna again.

These Maharathi broke his Bow. They broke his Sword and Chakra. He then destroyed Chariot of Ashwasthama with his Gada.
Then Son of Dushashan k!lled him with his Gada.

Abhimanyu was definitely most Powerful Warrior of his generation.