Otto Porter Jr. has two rebounds and an assist in his NBA debut after being sidelined for three months with a strained right hip flexor.
Rookie remains sidelined with a hip injury.
First-round draft pick has been unable to practice since the start of training camp.
The third overall pick misses out on the first day of training camp, is day to day.
Porter said after the game that he doesn't think the injury is serious.
Wizards assistant coach Don Newman said the team is "fishing around" to find the right fit for Otto Porter Jr., who is struggling at shooting guard.
The Wizards plan to use summer league as a time to test the versatility of Otto Porter Jr.
Thompson believes No. 3 pick in last month's draft will be able to adjust to the NBA.
Otto Porter Jr. and Glen Rice Jr. will make their Wizards debuts in Las Vegas, but second-year players Bradley Beal and Tomas Satoransky will sit out.
Otto Porter Jr. needed some convincing before deciding to visit Georgetown, now Washington is his home after being chosen third overall by the Wizards.