AO is very tough cuz it's played on a neutral surface where almost everyone is good at and takes place in the beginning of the year where everyone is 100% fresh and ready to go
FO is tough cuz it's arguably the most physically demanding of all 4, but at the same time s lot less prone to upsets (esp to those who are good on clay) cuz players have more time to figure things out and serves aren't as powerful or as big of a weapon
Wimbledon is played on a rare surface nowadays that is very difficult to master and usually takes players years of experience to get good on it and historically had the most upsets where a good serve also gives players a huge advantage, although the courts have been greatly slowed down over the years
And US Open is tough because it's the last of the 4 at which point the top players feel most tired and thus has been won the most by different players over the years
FO is tough cuz it's arguably the most physically demanding of all 4, but at the same time s lot less prone to upsets (esp to those who are good on clay) cuz players have more time to figure things out and serves aren't as powerful or as big of a weapon
Wimbledon is played on a rare surface nowadays that is very difficult to master and usually takes players years of experience to get good on it and historically had the most upsets where a good serve also gives players a huge advantage, although the courts have been greatly slowed down over the years
And US Open is tough because it's the last of the 4 at which point the top players feel most tired and thus has been won the most by different players over the years