Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
I've played a lot of LoL over the last couple have weeks and I have found that this is my favorite tank build for Singed. If it ever gets to late game with this build and you pop his ulti you are getting near 64 health a second, not an easy thing to out dps especially if you play Singed right and make everyone chase you.