As the tennis world prepares for the U.S. Open, the races to be ATP and WTA world No. 1 are getting interesting in Cincinnati.

Ten seeded players were in action during the Cincinnati Open quarterfinals Aug. 15. Here's how the action unfolded in Mason.

A ruthless Iga Swiatek won 10 of the last 13 games to beat Elena Rybakina 7-5 6-3 on Sunday and reach her first Cincinnati Open final after losing in the penultimate stage of the U.S. Open tune-up event in each of the last two years.

Honed at the racquet of Pete Sampras, Priority One owner Nate Ferguson and his staff bring a "new strings attached" service to Cincinnati Open tennis.

Cincinnati Open volunteer Phil Carver adopted the puppy that Jannik Sinner met after a match. Later, Carver got to meet Sinner at his birthday party.

Jannik Sinner enters the event paired with Katerina Siniakova in a new format designed to platform the biggest stars.

Frances Tiafoe, a finalist at last year's Cincinnati Open, was forced to retire from his Round of 16 match vs. Holger Rune during the second set on Wednesday because of injury. An official injury diagnosis hasn't been shared,

The stars featured at the Cincinnati Open on Aug. 9 for Round of 64 play, and Aug. 10 will feature similar action as the second round continues.