Barcelona today have matched their best streak of games in a row without losing to Real Madrid in El Clasico.
Barcelona's last defeat to Real Madrid was in the Copa del Rey of the 2016/17 season. And since then Valverde has kept 7 games unbeaten in El Clasico, which equals Guardiola's record.
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Manchester City
Real Madrid
Barcelona
Guardiola
Ernesto Valverde