Events where both the male & female world records are held by the same country:
100 Fly - Walsh & Dressel 🇺🇸
1500 Free - Ledecky & Finke 🇺🇸
4x100 Medley (+Mixed) - USA 🇺🇸
Smith, King, Walsh, Huske
Murphy, Andrew, Dressel, Apple
Murphy, Fink, Walsh, Huske
End.