"Yasuo got blasted by 8.15 (took the brunt of the IE nerfs [which were huge] without the balancing factor of the Stormrazor buffs).
We wanted to avoid pre-emptive buffing him, despite knowing it was power down, but I expect him to be weak on 8.15. (Pro is playing on 8.14).
We aren't going through with the Yasuo buffs as Scruffy stated, because we can't get good alignment on a changelist that is not frustration up (and he is a high risk buff candidate), but I suspect he'll be weak for this patch as a result." - Riot PhRoXz0n
Last Breath (R) bonus AD reverted from 250% to 150%
Sonic Wave / Resonating Strike (Q)
Sonic Wave damage reverted from 50/80/110/140/170 to 50/75/100/125/150
Resonating Strike damage reverted from 50/80/110/140/170 to 50/75/100/125/150