Gragas must control short trades and use passive sustain to deny Olaf's extended all-in attempts.
Manage lane pressure to avoid giving Olaf long melee fights where he excels with (R) and sustained damage.
This is a control vs snowball matchup where Gragas aims to disrupt Olaf's early aggression and scale into teamfights.
Trading pattern
Take compact trades using (W) and (E) when Olaf commits with (Q) or dashes in, then disengage quickly using passive healing.
Punish Olaf heavily after he misses (Q) or overextends, as he loses chase and all-in threat.
Use (R) displacement to isolate Olaf during his all-ins or to disengage when (R) is active and he gains crowd control immunity.
Danger windows
Olaf is dangerous when (Q) lands and he can pick it up, enabling chase and extended trades.
Respect (R) duration as it negates your crowd control and lets him ignore disengage tools.
Be cautious after missing (E), as you lose both engage and escape, making you vulnerable to Olaf's follow-up.
Early game
Use (Q) slows and (E) stuns to interrupt Olaf's axe pickups and prevent him from starting extended fights.
Avoid committing (E) unless passive sustain and wave state favor a quick burst trade.
Focus on short trades around passive and (W) damage reduction before level 6 to mitigate Olaf's early pressure.
Power spikes
At level 6, use (R) to disrupt Olaf's all-ins by knocking him away or isolating him from his team.
After first AP or tank item, leverage improved burst and durability to pressure Olaf in short trades.
Respect Olaf's level 6 (R) which grants crowd control immunity and enables extended fights; avoid fighting him during its duration unless you can disengage.
Win conditions
Win by controlling short trades with (W) and passive sustain, punishing Olaf's missed (Q) and overextensions with (E).
Use (R) strategically to isolate Olaf or disengage his all-ins, denying him the chance to force extended fights.
Maintain lane control to prevent Olaf from snowballing, then leverage your mid-game power spikes to pressure and roam or impact teamfights.
Tip: For Gragas vs Olaf, read overview, trading pattern, and danger windows first for a fast Top lane check.