Chelsea have won the Premier League Summer Series after a 2-0 victory over Fulham at FedExField in Landover, Maryland.
Thiago Silva's goal was a header from a Ben Chilwell corner, while Nkunku's came from close range after Fulham goalkeeper Bernd Leno could only parry a shot into his path. It was Nkunku's second goal of the tournament and his third since signing.
However, both teams suffered injury blows, with captain Tom Cairney going off for Fulham with a suspected hamstring injury, while Trevoh Chalobah only lasted 15 minutes having come on as a second-half substitute.
Chelsea's win means they end the tournament with two wins and one draw, and remain unbeaten in pre-season under Mauricio Pochettino. They have one match remaining, against Borussia Dortmund on 2 August, before their Premier League opener at home to Liverpool on 13 August.
Nkunku says lifting silverware in pre-season is a great boost ahead of the start of the Premier League.
"It's good for the confidence," he said. "We've had a great pre-season. We'll be ready for the season."