Double Olympic champion Mo Farah and 14-time Grand Slam champion Rafael Nadal are some of the latest players to have confidential medical data leaked online.
A Russian hacking group known as the Fancy Bears are once again responsible for releasing the information, which relates to Therapeutic Use Exemptions (TUE) that allow athletes to take drugs that would normally be prohibited.
The leak revealed two instances where the Olympic 5,000m and 10,000m champ Farah was given a TUE – once in 2008 and more recently when he was placed on a morphine drip in July 2014 after collapsing during training.
A Farah statement read: "As Mo has previously stated, he has got nothing to hide and doesn't have a problem with this or any of his ADAMS information being released.
"Mo's medical care is overseen at all times by British Athletics and over the long course of his career he has only ever had two TUEs.
"The first was back in 2008 for a one-off anti-inflammatory treatment to an injury.
"The second was in 2014 when Mo collapsed and was airlifted to hospital for emergency care, which consisted of painkillers and being placed on a drip."
Two of Nadal TUEs were also revealed, dated 2009 and 2012.
Others athletes whose information was leaked online include golfer Justin Rose, hockey players Alex Danson, Crista Cullen and Sam Quek, sprint cyclist Callum Skinner and rowers Helen Glover and Peter Reed.
Athletes who have been previously targeted include Olympic gymnastics champion Simone Biles, Grand Slam-winning siblings Serena and Venus Williams, and Tour de France winners Chris Froome and Sir Bradley Wiggins.