Coco Gauff poses with the trophy after defeating Karolina Muchova (not in photograph) of Czech Republic during the final of the Western & Southern Open at Lindner Family Tennis Center on Aug 20, 2023 in Mason, Ohio. (PHOTO / AFP)

Coco Gauff beat Karolina Muchova 6-3 6-4 to win the biggest title of her young career at the Cincinnati Open on Sunday and extend her outstanding run of form on North American hard courts ahead of the US Open.

The American teenager, seeded seventh, broke the Czech three times in the first set and confidently served out the opener to love in her first WTA 1000 final appearance.

Muchova was too inconsistent on a hot day in Ohio, committing 35 unforced errors in the match and badly missing a backhand down the line to hand Gauff the break and a 3-2 second-set lead.

Gauff had some trouble getting over the finish line, failing to convert three match point opportunities while serving at 5-2 thanks to some tentative groundstrokes.

Coco Gauff, of the United States, returns a shot to Karolina Muchova (not in photograph) of the Czech Republic, during the women's singles final of the Western & Southern Open tennis tournament, on Aug 20, 2023, in Mason, Ohio. (PHOTO / AP)

But she did not falter on her next chance as Muchova's return landed wide, leaving Gauff to jump up and down in jubilation.

Muchova, who was ranked 235 in the world a year ago amid injury woes, will enter into the world's top 10 for the first time despite the loss.

Gauff, who improved her record to 11-1 since falling in the first round of Wimbledon last month, looks poised to be a real threat when she arrives in New York for the final major of the year, which runs from Aug 28-Sept 10.

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"This is unbelievable, especially after everything I went through in the summer in Europe," Gauff said during the trophy presentation.

Karolina Muchova returns the ball during the women's singles final of the Western & Southern Open at Lindner Family Tennis Center on Aug 20, 2023 in Mason, Ohio. (PHOTO / AFP)

"I'm just happy to be here in this moment. I spent a lot of nights alone crying, trying to figure it out."

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Following her early exit from Wimbledon, she won the title in Washington DC, reached the quarters of the Canadian Open before completing her victorious run on Sunday in a tournament where she beat world number one and US Open champion Iga Swiatek for the first time.