It is not uncommon for professional athletes to rate their best performances or accomplishments among their finest. In this case, it seems that the player, David Warner, is expressing his appreciation for his double century (200 runs) at the Melbourne Cricket Ground (MCG) as one of his finest performances.
The MCG is a well-known cricket stadium in Melbourne, Australia, and is considered one of the premier cricket venues in the world. A double century is a rare feat in cricket, and achieving it at such a prestigious venue may have added to the player's sense of accomplishment.
It is important to keep in mind that individual performances in sports can be influenced by a variety of factors, including physical conditioning, mental focus, and team strategy. Achieving a personal best or a notable accomplishment can be a source of pride and motivation for athletes, and it is not uncommon for them to reflect on their finest moments or accomplishments.