Injuries or even mono are not valid excuses for losing. Otherwise, every single player could come up with an excuse. Delpo and Soderling without injuries or mono likely would have improved and won a ton of slams. But I cannot prove this theory at all. It's all speculation.
At the end of the day, all the matters is the player that raises the big trophy. Trying to downplay a slam title is a joke.
With that being said, congrats to Nadal for bringing home #19. Granted, I really wish that Federer would hold the record. But each one of these players earns the title. I have no excuses here. Nadal beat the best players in the world at that time.
None of us posters here have a right to downplay any title in which a player was the best in the world while taking home millions of dollars in a fortnight. Nadal earned his 19th slam title 100%. Heck, an in-form Federer in 2017 lost to #116 Donskoy in Dubai(a title Fed has won 7 times) and to #302 Haas on grass. Those were the only two losses that Federer had until the Montreal final rolled around. Beating 7 pros in a row is an amazing feat. At any time, a top-5 player can be bumped from a tourney.
Nadal, please stop at #19. But if you don't, you'll deserve all of the accolades that come your way. #21 will slam the door shut on all of this, provided that Fed is done winning.
Tomorrow is never guaranteed. So let's not get ahead of ourselves either. But things are looking good for Nadal. But as all of us have learned, never count any of these guys out of it.