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 usually start with boots of swiftness to get some early kills, too sell them later for ninja tabi or mercury's threads depending on the enemy setup. The last two items may change according to the enemy setup, if it is a pure dps team I'll pick Frozen Heart and guardian angel/thornmail, or, Banshee's veil and Force of Nature for a pure caster team. I don't focus much on attack speed since tiger stance and the stance dancing pretty much take care of it.
Hope you enjoyed :)