Jayce vs Olaf Counter Pick

Olaf answers nearly every tool Jayce relies on. He moves at 350 against 335, so the movement speed from Hextech Capacitor buys a little distance rather than safety; Ragnarok makes him immune to disables while he attacks, which cancels the knockback on Thundering Blow; and Reckless Swing deals true damage, ignoring the 22 base armor and 107 at level 18 that Jayce would otherwise hide behind. The result is 41.8 percent across 110 games on patch 16.13.1.

The health comparison is equally uncomfortable. Olaf reaches 2,668 at level 18 against 2,443 and holds 68 attack damage against 59, while missing health feeds Berserker Rage, which returns attack speed and life steal precisely when he is closest to dying. Tough It Out adds a shield on top of that, so the window for trading with him narrows as the fight continues.

What remains is distance management before Ragnarok comes online. Both attack from 125 units, so cannon stance is the only tool that manufactures a gap. Undertow slows and reduces armor only if the axe connects, and a missed throw costs Olaf a long walk to pick it back up. A charged Shock Blast through an Acceleration Gate is the safest damage available, and a difficulty rating of 7 against 3 describes how much execution the losing half of this matchup demands from Jayce.