Mouratoglou has worked with Serena Willaims since 2012 and he helped guide Williams to 8 grand slam trophies under his coaching. The French Tennis coach has always spoken about Serena in superlatives and he believes she will end up being the greatest of all time even if she doesn't match the famous Margaret Court's grand slam record:
“Margaret Court was playing at a time when three-quarters didn’t even go to Australia (for the Australian Open), where tennis was an amateur
sport, when the draws were 16 players. I don’t mean to disrespect Margaret Court, but
it’s another era. Yes, it would be better if Serena broke her record
but, if she doesn’t, she will still be the greatest player of all time.”
It's a fair point by Mouratoglou who is right in saying that the eras are different which means that the achievements of both should be looked at differently. The last Grand Slam success for Serena came at the 2017 Australian Open but Mouratoglou is adamant she still has what it takes to play at the highest of levels:
“She still has it. The question is how much she wants it and what is she willing to do to get there? Since she had her daughter, it’s harder. She has a lot of trouble not putting
her life as a mother before her life as a player which is completely
understandable. I think that’s the main reason she didn’t win a
Grand Slam. Her family comes first and in order to be able to do great
things in one area, that area can’t come second."
Mouratoglou was also asked about what the future holds but he was rather coy about it saying:
“She is reflecting and we will see what comes out of it.”