Yorick vs Gwen Top Matchup
Yorick Top wins 47.6% of 1,132 Low Elo games against Gwen Top, -2.4 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 Gwen is favored
Gwen's repeated Needlework casts and champion-hit healing make a straight all-in dangerous for Yorick. Current Yorick players describe chipping her with E, Walkers and Maiden instead, then using W to disengage when she commits her ultimate, which fits Gwen's +2.4pp edge in Low Elo.
How to play as Yorick
Chip Gwen with Mourning Mist(E) while Walkers and Maiden are active instead of forcing a close all-in into her Needlework(R) and healing. If she commits R, use Dark Procession(W) to disengage until the remaining casts are gone.
Patch 25.07 removed Mist Walkers' automatic one-hit death to champion attacks and single-target damage; Gwen's Snip Snip(Q) can still hit multiple Walkers with its cone, but does not use the old instant-kill rule.
Gwen's Needlework(R) can be cast repeatedly and A Thousand Cuts(P) heals her when it damages champions; Yorick can use Dark Procession(W) to block her path while retreating from that all-in.
How to play as Gwen
Use Needlework(R) to threaten an all-in, but do not spend every cast chasing Yorick through Dark Procession(W); he can cage you and retreat until the sequence ends. Keep pressure on him when his cage is unavailable rather than trading into his full Maiden-and-Walker setup.
Sources
These notes come from leagueoflegends.com and r/yorickmains, checked against the champions' abilities.