Serena Williams Injured in Wimbledon Return

Serena Williams tweaked her right knee during her first singles match in nearly four years, losing to Australian Maya Joint in three sets at Wimbledon.

The injury puts her planned doubles appearance with sister Venus in doubt, though Williams says she hopes to still compete.

The 44-year-old's return to Centre Court had been one of the most anticipated storylines of the tournament.

Her behavior after the loss drew criticism from some commentators, who branded her a sore loser.