World number one Iga Swiatek says she feels like the "kid from kindergarten" around retiring 23-time Grand Slam champion Serena Williams. Swiatek is in Cincinnati for this week's Western&Southern Open as she tunes up ahead of this month's US Open at Flushing Meadows, where she is likely to go in as the favourite. The Pole will face Sloane Stephens in the second round in Cincinnati, while Williams is up against Emma Raducanu in an eye-catching first-round clash on Tuesday on the other side of the draw.

Swiatek and Williams have never faced off on the WTA Tour and the 21-year-old, who has two French Open titles to her name, revealed she has never met the 40-year-old, who will finish her playing career at the US Open. "I have a hard time catching eye contact with Serena," Swiatek said.

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