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.
Try and get the middle lane if your team has faith in you after you get to know this build, and get the feel for how well olaf does in what situations and learn timings on when to use his abilities vs each champ. ill add a bit later kind of tired here now. I've seen people asking for a dps olaf build around and what not and this is mine. i've gotten several quadra kills and quite a few pentakills 1v4 and 1v5 style with this build. if you dont believe me add me in game and you can check my profile