The 33-year-old striker, who came on after the interval, latched onto a through pass from teammate Wu Xi before sending it into the net in the 65th minute.
Duplantis tried to challenge Sergei Bubka's 26-year-old outdoor record of 6.14 meters, but failed to continue after one unsuccessful attempt at 6.15 meters as darkness set in.
"It was a fantastic evening. The conditions, crowd, competition - it was all fabulous. Sam is a fabulous competitor, and I feel we bring the best out of each other," Duplantis added.
With his final stage win, Valter became the overall winner of this year's Tour de Hongrie.
The 54-year-old Dane announced he has been receiving medical treatment for the condition after being diagnosed some years ago and, with the assistance of doctors, has continued to carry out his duties as BWF president "without limitation," said the world governing body.
"Our original partnership was mainly focused on the World Cup in China. We are thrilled that this has now expanded to be a more all-encompassing partnership across all FIBA competitions."
"My team was fantastic during the whole race. Today I felt very good, my legs were really good, until the attack I could ride easily. Also, I was very motivated. Many people supported me along the roads, and I want to thank everyone," Valter said after the race.
There were also second round wins for fourth seed Stefanos Tsitsipas of Greece, fifth seed Alexander Zverev of Germany and seventh seed David Goffin of Belgium.
"These are needless deaths. Needless. We should be similar to most countries on the planet, and yet, we are an embarrassment, and a tragic embarrassment," Lurie added.
Lurie took charge of the Eagles in 1994, and led the team to its first Super Bowl title in 2017.
"Our development will not be redirected. It is just a strategic adjustment based on reality. We will continue to hand the best services to our fans and partners," it added. Enditem