Gangplank vs Yone Top Matchup
Gangplank Top wins 51.1% of 3,290 Low Elo games against Yone Top, +1.2 points vs expected, 2-patch window 26.19-26.20.
Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.
Why Gangplank is favored
Gangplank's Parrrley(Q) and Powder Keg(E) pressure Yone as he approaches, while Remove Scurvy(W) can clear the disabling part of Yone's Q3 knockup. Yone mains describe the lane as a dance around barrels, so Gangplank can make Yone's engage costly unless Yone feints or redirects into a keg.
Measured in High Elo: Gangplank wins 2.0pp more often than expected over 2,254 games.
How to play as Gangplank
Keep a Powder Keg(E) near Yone's Soul Unbound(E) return point when he commits; Gangplank mains recommend placing a barrel where Yone will snap back.
If Mortal Steel(Q)3 knocks you airborne, use Remove Scurvy(W) to clear the disabling stun, but expect the forced movement to continue.
Remove Scurvy(W) can remove the disabling stun attached to Yone's Mortal Steel(Q)3 airborne effect, but it does not stop the forced displacement.
How to play as Yone
When committing with Soul Unbound(E) and Q3 into Gangplank, attack his Powder Keg(E) instead of him if he is sitting on it; Yone mains recommend this timing to improve the trade.
Sources
These notes come from LoL Wiki, r/YoneMains, and r/gangplankmains, checked against the champions' abilities.