Miami John Building an Early Stack

A player raised it to 200 from middle position and Miami John Cernuto re-raised it to 600 and was called. On a A-J-9 flop, Cernuto bet 600 and the other player re-raised all-in for 1200 total. Cernuto showed A-K to his opponent's A-Q. The turn and river were 10-7 and Cernuto is up to 5,000 chips.