Sachin Tendulkar's connection with Sir Donald Bradman began with a neighbour's letter from Australia's cricketing great

"When were you first aware of Sir Donald Bradman?" I ask.

"It has to be at home," Sachin Tendulkar says. "I must have been around five years old."

I'm interviewing the Indian cricket great for the documentary, Bradman and Tendulkar, for ABC.