Shelton defeated Arthur Fils 7-6 (4), 6-1 as Team World took an early lead over Team Europe at the Laver Cup international tennis tournament.
Cerundolo added to that with a 6-3, 7-5 win over Alejandro Davidovich-Fokina for Team World’s second win of the tournament.
Shelton won 85 percent of first-serve points and had the only two breaks of the match, both coming in the second set.
“I thought it was a great match. Pretty high level from the start,” he said.
Cerundolo thrived on his serve in his match against Davidovich-Fokina with four aces, but repeatedly struggled to finish off his European counterpart.
Shelton’s win marked the first time Team World has won the opening match at the Laver Cup.