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Competing in windy conditions, the Brazilian recovered from squandering three set points in the first set to triumph after two hours and 10 minutes. With his 13th tour-level win of the season, the 18 year-old became the youngest match winner at the ATP 250 since three-time champion Taylor Fritz in 2015.

“I am very happy to win my first match on grass, here in Eastbourne, in such a nice place and against a very good player,” Fonseca said. “After a tough tie-break, getting through mentally is very good. I am very happy for this one.”

Fonseca, competing in his third tour-level grass-court match, will meet top seed Fritz in the second round. The World No. 57 produced moments of magic against Bergs, highlighted by his stunning pickup to break for 4-2 in the third set. Fonseca will hope to bring that level against World No. 5 Fritz in the pair’s first meeting.

British wild card Daniel Evans defeated Miomir Kecmanovic 3-6, 6-4, 6-4.

Italian Mattia Bellucci beat Quentin Halys 6-4, 6-2. 

Evans next faces Tommy Paul and Bellucci meets Giovanni Mpetshi Perricard or Cameron Norrie.