Johanna Konta took just 53 minutes to beat former world number one Williams on 30 July

Serena Williams says she discovered just minutes before her match against Johanna Konta last month that the man convicted of killing her half-sister had been released on parole.

Briton Konta inflicted the worst defeat of Williams’ career by winning 6-1 6-0 in the first round of the Silicon Valley Classic in San Jose.

Williams’ elder half-sister Yetunde Price was shot dead in 2003 aged 31.

“I couldn’t shake it out of my mind,” said the 23-time Grand Slam champion.

Robert Maxfield was jailed for 15 years in April 2006 and Williams, 36, attended the sentencing.

She told Time