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New York - Angelique Kerber marked her elevation to the world number one ranking by reaching the US Open final on Friday with a 6-4, 6-3 victory over Caroline Wozniacki.
The 28-year-old left-hander, who won the Australian Open in January and was Wimbledon runner-up in July, is the first German woman to reach the final in New York since Steffi Graf in 1996.
She will emulate Graf as US Open champion if she gets the better of Karolina Pliskova, who stunned Serena Williams 6-2, 7-6 (7/5) in her semi-final, in Saturday's championship match.
Graf is also the only other German woman to achieve the top ranking.
"It's incredible to be in the final and to be the world number one, it's a great day," said Kerber who has made the final without dropping a set.
The German leads Pliskova 4-3 in their head to heads, but the Czech won their most recent meeting in the Cincinnati final last month.
Just moments after becoming the oldest first-time world number one, Kerber raced out of the blocks against the Dane, a two-time runner-up at the tournament.
Two breaks of serve gave her a 4-0 lead after just 15 minutes, conceding only five points in the process and she had two more break points in the fifth which a desperately scrambling Wozniacki saved to finally get on the board.
The 26-year-old Wozniacki, a former number one, consulted a page of scribbled notes in the changeover and the handy hints proved just that as she retrieved a break to go 2-4.
Wozniacki saved two set points in the ninth game but the German left-hander secured the opener on serve at the next time of asking.
Wozniacki, down at 74 in the world after missing almost three months of the season with an ankle injury, had refused on the eve of her fifth semi-final in New York to dampen speculation that she was on the brink of announcing her retirement.
She certainly appeared to have her mind elsewhere as she slipped 2-0 down in the second set before a 27-shot rally in the third game helped her open her account.
Kerber was ruthless in her pursuit, breaking again for a 4-1 lead before she cracked when serving for the match, getting broken to love.
It was a brief respite as she then broke for the fifth time in the match to march into a third Grand Slam final of the year.
Wozniacki at least has the consolation of knowing her surprise run to a fifth semi-final in the city where she keeps a second home will translate to a place back in the world top 30.
Results from the 11th day of the 2016 US Open tennis championships at Flushing Meadows on Thursday (x denotes seeded player):
Women
Singles
Semi-finals
Karolina Pliskova (CZE x10) bt Serena Williams (USA x1) 6-2, 7-6 (7/5)
Angelique Kerber (GER x2) bt Caroline Wozniacki (DEN) 6-4, 6-3
Doubles
Semi-finals
Bethanie Mattek-Sands/Lucie Safarova (USA/CZE x12) bt Ekaterina Makarova/Elena Vesnina (RUS x5) 6-2, 7-6 (7/4)
Caroline Garcia/Kristina Mladenovic (FRA x1) bt Martina Hingis/Coco Vandeweghe (SUI/USA x6) 6-3, 6-4
Men
Doubles
Jamie Murray/Bruno Soares (GBR/BRA x4) bt Pierre-Hugues Herbert/Nicolas Mahut (FRA x1) 7-5, 4-6, 6-3
Pablo Carreno Busta/Guillermo Garcia-Lopez (ESP) bt Feliciano Lopez/Marc Lopez (ESP x8) 6-3, 7-6 (7/4)
