Throughout the French Open, there have been several more incorrect calls, all of which could have been avoided if tennis implemented a simple instant replay system.
In the Williams vs Azarenka match, a point was incorrectly replayed when an incorrect out call came well after Serena failed to return Azarenka's shot. Instead of Azarenka serving at 5-5 deuce, with momentum on her side after coming back from triple break point down, Azarenka had to serve at 5-5 30-40, forced to save a fourth break point in a row immediately after knowing she had been cheated out of a point that was rightfully hers.
In the Tsonga vs Nishikori match, Nishikori was serving at 1-5 15-40 in the second set when Tsonga missed a service return just as the line umpire was making an incorrect out call. The point was not replayed, and Nishikori, who looked dejected and on the verge of losing that game and the second set, went on to win the game. After a lengthy delay because of debris falling from the stadium roof, Nishikori won two more games and came close to getting back on serve in the second set. He used that momentum to win the third and fourth set. How different would the match have been if, before the disruption in play, Tsonga was up two sets to love and serving first in the third set?
In the Federer vs Wawrinka match, a point was not replayed when an incorrect out call was made as Federer was hitting a ground stroke in the third set tie break. Instead of the point being replayed, Federer lost the point to go down a mini-break, and never recovered.
It is impossible to eliminate officiating errors, and this is not a criticism of umpires (to be fair, players make far more mistakes than umpires do.) But why not introduce a simple replay challenge system for these situations, and get the call right?