Serena Williams was at the centre of a Wimbledon health scare on Tuesday when she wept and appeared to be close to fainting in a doubles match with sister Venus.

US superstar Serena, the world No.1 singles player, called the doctor to Court One just after she and Venus warmed up for their second round match against Kristina Barrois and Stephanie Voegele.

She broke down in tears as she consulted with the doctor and physio before the tournament referee and supervisor were called to court in a reflection of her status in the sport.

Serena served up four double faults in her first service game, wobbled on the baseline before Venus led her back to her chair.

Umpire Kader Nouni, having already come down from his chair to talk to the Americans, announced that Serena was retiring from the match through illness with the sisters trailing 3-0.

Later on Tuesday, the WTA Tour said Serena was suffering from “a viral illness”.