Tim van Rijthoven made the most of a rare main tour berth as he claimed a first title by sweeping aside Daniil Medvedev 6-4, 6-1 in the final of the grass court tournament in 's-Hertogenbosch.
The 25-year-old Dutchman, ranked 205th in the world, took 1hr 5min to crush the Russian who, despite the loss, will return to number one in ATP rankings on Monday.
Van Rijthoven, who was invited into the Dutch event as a wild card, had spent this season, like most of his career, on the second tier Challenger Tour.
"Last time I saw him was in juniors," said Medvedev said ahead of the final. "Probably we saw each other last when we were 18 years old."
Van Rijthoven fell in the qualifying rounds of this year's first two majors, but he is the only one of Sunday's singles finalists in 's-Hertogenbosch eligible to play at Wimbledon.
Medvedev and the two women's finalists, Belarusian Aryna Sabalenka and Russian Ekaterina Sabalenka, are banned from the grass-court major following Russia's invasion of Ukraine.