Genki Haraguchi added in the 6th minute after half time, but that goal wasn't particularly hit hard.
Sanfrecce goalkeeper Shusaku Nishikawa should have had the easy catch.
His blunder virtually gifted Urawa Reds a goal.
Urawa has three ex-Sanfrecce players.
All they were in high spirits yesterday against their former team.
They're now Urawa Reds players.