Olaf & Syndra Synergy
Olaf Top and Syndra Mid win 54.6% of 1,264 Low Elo games together, +2.0 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 this duo works
Olaf's strong lane pressure gives him a reason to commit when Syndra lands her stun, and he can keep threatening the target after the stun ends. Syndra players specifically recommend Olaf as a top-lane partner because he can follow her crowd control while drawing pressure away from her.
Playing the duo
Syndra's Q-E can stun a target for Olaf to follow up on, and Undertow(Q) slows a target he is chasing; Olaf can then keep attacking through disables while Ragnarok(R) is active.
How to play as Olaf
Follow Syndra's landed Q-E stun with Undertow(Q) and keep the axe pickup path open so you can continue slowing the target during the chase.
How to play as Syndra
When Olaf is close enough to follow, use Q-E to stun a target and give him a clear opening to engage; avoid using the combo on a distant target he cannot reach.
Sources
These notes come from r/syndramains, checked against the champions' abilities.