Orlando had rallied from 3-1 down in a wild
second half to tie the score on Erin Greening's goal in the 90th minute.
Deep in stoppage time, Gabby Seiler sent a looping shot that was pushed over the crossbar by Pride keeper Hayley Kopmeyer. On the ensuing corner kick, Meghan Klingenberg found Lussi at the right post, where she headed the ball into the back of the net just before the final whistle.
The game was the first aired on ESPNEWS as part of the new ESPN contract the NWSL signed for the remainder of the 2019 season.
"ESPN better send some commission to Portland and Orlando," said Thorns coach Mark Parsons, "because that was a heck of a way to open up your TV games."
No U.S. World Cup team players played this past weekend, but players from other World Cup teams have returned to action, including Marta, whose rocket was the first of six goals scored in the second half.
"Credit to Orlando," said Parsons. "I thought they showed a lot of character. Look at their individual talent -- they've got so much quality and talent on their team. You give them an inch, they're going to take it. They had three or four looks and they put three of them away, which is obviously a problem for us but credit to them for."