Vayne vs Sett Top Matchup
Vayne Top wins 50.2% of 1,221 Low Elo games against Sett Top, +2.2 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 Vayne is favored
Vayne's 550 range, Tumble(Q), and Condemn(E) make it difficult for Sett to start the close fight he needs, while Silver Bolts(W) continues to threaten his health if he does connect. Sett is left looking for an overextension or a committed flash engage, so Vayne controls more of the lane and the sustained damage.
How to play as Vayne
Keep Condemn(E) for Sett's commit instead of spending it to poke. Prioritize safe farm early and turn back to trade after he spends Facebreaker(E).
Facebreaker(E) is Sett's close-range catch, while Condemn(E) knocks a target back and can stun them against terrain; their E cooldowns shape whether a close trade continues.
Silver Bolts(W) deals bonus true damage based on a target's maximum health after repeated hits, so Sett's health-heavy build does not make him safe in an extended fight.
How to play as Sett
Play patiently and prioritize farm until Vayne oversteps near your tower or your jungler is close. Keep Facebreaker(E) for that engage; a straight walk-up gives her room to kite.
Sources
These notes come from r/settmains and r/vaynemains, checked against the champions' abilities.