First of all, you rushed Atma's Impaler even after going against an AP champion. Infact, you already messed up after rushing it. It is a waste of money early game, giving barely any AD, and the armor may not be put to good use. The crit alone following no other crit items, and no attack speed. You would be lucky to actually land a crit. You also took a point on Frenzy with only 15% crit chance.

I will do some simple Math:

1.6269 AA/second w/ Tiger stance = 4.807 AA/3 seconds.

With 15% crit chance. You need to land 6-7 AA for one crit attack. Which means that by the time you get one crit, Frenzy 's stacks are to easily reset, and the maximum number of stacks you'll get mostly if one, two if you're really lucky! So it really isn't worth putting a point on.

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And for the second part:
You did not explain what double tiger is.
If this guide was intended to help people play Udyr, you'll have to explain what it is, am I not right?

Edit: On the other hand, I just noticed that the mastery Frenzy was renamed after Volibear's.. wp Riot.

This is what happens when you remain logged in on a school computer, srry mate.

would be nice if you explain why, i checked your profile and i saw almost all your comments were troll comments were u ***** about others guide, so i really dont care what you think.