Novak Djokovic prevailed in his opener over Aleksandar Kovacevic but again controversy reared its head this time at the French Open surrounding line calls and the use or lack of Electronic Line Calling.
Djokovic in particular saw it discussed after Monte-Carlo and fumed at the umpire again at Roland Garros.
VIDEO: Djokovic loses point after big mistake from umpire at Monte-Carlo Masters, booed by crowd
A let call was very dubious and Djokovic made straight for the umpires chair. "Can you check the machine, this is incredible," said Djokovic.
"I can't over rule it once it's gone off," said the umpire. "It's happening five times this match already," replied Djokovic.
Djokovic had to make do with it and despite winning with ease it showed that the lack of ELC in men's tennis is hindering it slightly.
Watch the video below.