Leo Borg, son of Swedish tennis legend Bjorn, lost his first professional match on Tuesday, falling in straight sets at the second-tier Challenger event in Bergamo, Italy.
The 16-year-old Borg, who is ranked 98 in the world junior rankings, received a wild card to the 46,000-euro Bergamo tournament after some good results in junior events.
But the Swedish youngster fell 6-3, 6-1 to qualifier Tseng Chun-hsin of Taiwan, an 18-year-old ranked 301st in the world.
Borg is the son of the 11-time Grand Slam champion and his third wife Patricia Ostfeldt.
The 63-year-old Borg won 64 ATP tournaments during his career including six French Open and five Wimbledon titles between 1974 and 1981.