First Blood tracking was discovered to be broken in the Oracle’s Elixir database for much of the 2017 spring split. The issue has been resolved, and all First Blood data should now be accurate.

Apologies for the inaccuracy, and thank you to Riot Timbolt for identifying the issue.

Check out the new map side win rates scrying orb: this interactive visualization will let you track blue vs. red win rates for each patch and each major professional league.