The stunning finish at SoFi Stadium sets up a tantalizing showdown between European champions Spain and the tournament favorites France and the red-hot Kylian Mbappe in Dallas on Tuesday, AFP reported.
But it was heartbreak for Belgium's substitute goalkeeper Senne Lammens, sent on late, who spilled a shot into the path of Merino.
The dramatic finale came after Fabian Ruiz had opened the scoring for Spain, before Charles De Ketelaere grabbed one back for Belgium against the run of play before halftime, according to AFP.