The record-setting night ended at 13-0.
The last time they played, it got ugly.
In total seven Americans scored during the match - Morgan (5), Lavelle (2), Mewis (2), Horan, Megan Rapinoe, Mallory Pugh and Carli Lloyd all finding their way on to the scoresheet in a performance that is bound to strike fear into all of those teams hoping to end the United States' reign as world champions.
Eight minutes later Rose Lavelle found the net with a left-footed shot while midfielder Lindsey Horan gave them a 3-0 lead going into the interval.
An offside decision cost Morgan a fifth-minute opener but the prolific forward would not be denied, nodding in Kelley O'Hara's dinked cross with aplomb to open the scoring.
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Elsewhere, Sweden overcame hard conditions to beat a stubborn Chile side 2-0 in their opening game in Group F in Rennes.
For what it's worth, the United States has lost just once in the group stages of the Women's World Cup and Thailand really has no business being in the tournament. Yet, the score remains goal-less.
Mallory Pugh became the 32nd different player (excluding own goals) to score for US at the Women's World Cup, only Germany have more different scorers in the competition's history (34). She now ties with Michelle Akers' previous World Cup record set in 1991.
Samantha Mewis' opening goal for US was the 800th goal scored in Women's World Cup matches, with United States of America responsible for 116 of them - more than any other team.
The USA will face Chile in Paris at 17:00 BST on 16 June, three hours after Thailand meet Sweden.
The top two teams in each of the six groups will qualify automatically for the last 16, along with the four best third-placed sides.