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Most of Federer's records are the best among men, but are trumped by the records of women like Navratilova, Evert and Graf. Wherever you stand on arguments about comparison across gender, it still robs a few of Federer's records of a little of their luster.
But his semifinals record? As with the last three records on our list, this too is a record that stands alone amongst all tennis players.
From Wimbledon 2004 through Australia 2010, Federer was always there on the final weekend. Always. It's hard to imagine a semifinal being taken for granted, but Federer made us think of it as almost ordinary.
The comparables? Navratilova had 19. Graf had 15.
The next best on the men's side? A mere 10, held by Lendl.
So why does it grab the number one spot? Because it's the record most likely to stand the test of time.
Think about how consistently healthy, injury free, and simply great you have to be to attain such a streak. Think about the number 23, and that it equates to nearly six years of dominance.
Think about all the amazing players who are simply not close to touching Federer, and imagine the type of player who would have to come along to stand a chance of nabbing this record.
Nadal had five semifinals in a row, from 2008 Australia through 2009 Australia. He currently has a run of just two semifinals.
To top Federer, he would need to reach the semifinals or better in the next 22 grand slams. In other words, every grand slam until he's nearly 31. Possible? Of course. Everything is, in theory.
But it's as close to impossible as you'll get.