Novak Djokovic says he is "aware people would disagree" with him writing a political message about Kosovo on a French Open camera lens but it is an issue he "stands for".
Djokovic, 36, wrote "Kosovo is the heart of Serbia. Stop the violence" after his first-round win on Monday.
France's sports minister said the Serb's actions were "not appropriate" and should not happen again.
"A drama-free Grand Slam, I don't think it can happen for me," said Djokovic.
"I guess that drives me, as well."
The phrase Djokovic wrote is in reference to recent tension in Kosovo, which declared independence from Serbia in 2008.