Kim Seok-jin, known simply as “Jin” to his army of fans, was caught on camera watching the world No. 2 survive three sets with Nicolas Jarry at the Eugene Korea Open Tennis Championships.

“It is apparent that the consumption of bespoke supplements, in particular those made in compound pharmacies in South America, carries with it a significant degree of risk for sportsmen and women who are subject to anti-doping rules,” the ITF said.