Conversation so far:
When did Gautam Gambhir begin playing?
Gambhir started playing cricket at the age of 10.
When did Gautam Gambhir's early career begin?
He made his ODI debut against Bangladesh in the TVS Cup in 2003.

Question: What was important about his early career?
Self-contained rewrite: What was important about Gautam Gambhir's early career?