Their only clash? Emma Raducanu beats Serena Williams in straight sets 

The 19-year-old paid tribute to Williams in her on-court interview after the match.

Emma Raducanu defeated Serena Williams 6-4 6-0 in their first and likely last encounter on the court (Aaron Doster/AP)

Emma Raducanu defeated Serena Williams 6-4 6-0 in their first and likely last encounter on the court.

Williams, 40, struggled to find consistency in just her fourth match of the season, giving up 12 unforced errors while making just 11 winners in the first round of the Western and Southern Open in Cincinnati.