American eighth seed Amanda Anisimova produced a stunning upset of Iga Swiatek to reach the semi-finals of the US Open on Wednesday and avenge her Wimbledon final drubbing.

Anisimova – who suffered a crushing 6-0, 6-0 defeat as Swiatek clinched her first Wimbledon title in July – bounced back from that double-bagel disaster to win 6-4, 6-3 on the Arthur Ashe Stadium court.

Polish second seed Swiatek entered the US Open as the bookmakers' favourite after following up her triumph at Wimbledon with victory in the WTA Cincinnati Open event last month.

But the six-time Grand Slam champion's hopes of adding a second US Open title to her collection were dashed as Anisimova roared to a redemptive victory in an absorbing one hour 36-minute battle.

"To come back from Wimbledon like that is really special to me," said Anisimova, who clinched victory in the second set after a net cord bounced in her favour on match point.

"I feel like I worked so hard to turn it around after that–I knew I was going to have to dig really deep. It was such a tough match, truly a battle for me," added the American, whose lopsided loss at Wimbledon was only the third Grand Slam final in history where a player had lost without winning a game.

Swiatek said her defeat was down to her struggles on her service game, where she managed only a 50 percent success rate on first serve, and won just 10 of 30 points on second serve.

"I couldn't win today's match playing like that, serving like that, and with Amanda being so aggressive on the returns," she said, adding that Anisimova's performance contrasted sharply with her Wimbledon display.

"It was totally different," Swiatek said. "She moved better, she played better. Everything was different." (AFP)