Djokovic: "I don't really understand the rules".

Novak Djokovic had a very, almost too quiet start to the tournament on Saturday.

After defeating Mathew Ebden, who hadn't played singles for two years, in less than an hour (6-0, 6-1), the Serb was left to wonder about the Olympic Committee's repechage rules.

As a reminder, it was following Andy Murray's withdrawal from the singles draw that the Australian was recalled to face Djokovic.

In a press conference, "Nole" declared: "My body is fine, unfortunately the last time I was here I injured myself, but I'm happy that this match turned out the way it did.

I'm sorry for Matthew, he told me at the net that it was his first singles match in two years, that he had officially retired from singles. It's tough for him.

I don't really understand the rules, why they have to draft someone from doubles when there are Top 100 players waiting to get into the draw, with enough time to come and play."