American captain Zach Johnson, who is already coming in for social media criticism for holding back four major winners, sent them into action on a scorching day in Rome.
Justin Thomas and Jordan Spieth will face Viktor Hovland and Tyrrell Hatton in the first game at 10.25GMT.
Brooks Koepka gets his first outing alongside Scottie Scheffler against Jon Rahm and Nicolai Hojgaard while Wyndham Clark teams up with Max Homa against Bob MacIntyre and Justin Rose.
The final match of the day sees Europe's Rory McIlroy and Matt Fitzpatrick play Collin Morikawa and Xander Schauffele.
Reporting by Mitch Phillips, editing by Toby DavisOur Standards: The Thomson Reuters Trust Principles.
Persons:
Ryder, Marco Simone Golf, USA's Justin Thomas, Guglielmo Mangiapane, Zach Johnson, Justin Thomas, Jordan Spieth, Viktor Hovland, Tyrrell Hatton, Brooks Koepka, Scottie Scheffler, Jon Rahm, Nicolai Hojgaard, Wyndham Clark, Max Homa, Bob MacIntyre, Justin Rose, Europe's Rory McIlroy, Matt Fitzpatrick, Collin Morikawa, Xander Schauffele, Mitch Phillips, Toby Davis
Organizations:
Country Club, Rights, Thomson
Locations:
Rome, Italy, Europe, United States