Nadal and Djokovic are part of a massive send off for Massu that includes a presidential farewell with Chilean leader Sebastian Pinera as well as a special doubles match between Nadal, Djokovic, Massu and Argentina's David Nalbandian at Santiago's Movistar Arena.
"It's a pleasure to share these days with good companions. It's also a tribute to Nico, it's a special situation. We hope that the public responds well and dedicate this homage to the heights that he (Massu) achieved for Chilean tennis," said Nadal.
Showing no bad blood with his number one rival, Djokovic told media he was happy to work alongside Nadal for the special event.
"It's a great pleasure to sit here, to sit with the three great champions and also great people alongside me. And I was very much looking forward to this for a few months, knowing that we are going to have two great matches," he said.
The Spanish 13-time Grand Slam champion also doubled up with Djokovic for a tennis camp with disabled children, with crowds delighted to watch the world's top two ten greats hit a few balls over the net with local kids.
Nadal has enjoyed a remarkable season winning 10 titles and returning to the top of the rankings after a seven-month injury layoff returning from injury to dominate the hardcourt tournaments.
Nadal recaptured his world number one status in October after dominating the hardcourt tournaments. He had not topped the rankings since July 2011.
But biting at his heels is Djokovic who is currently enjoying a 22-match winning streak since claiming the ATP World Tour Finals title for a third time earlier this month.