The word “DOPING” is printed in capital letters inside a red circle with a slash through it on the box containing the over-the-counter spray sold in Italy that caused No. 1-ranked tennis player Jannik Sinner to fail two drug tests in March. Sinner was cleared last month and will play Jack Draper in the U.S. Open semifinals Friday. Trofodermin, which contains the banned anabolic steroid Clostebol, is available without a prescription in Sinner’s home country — and that’s where the 23-year-old’s physical trainer bought the medication that led to a trace amount of Clostebol showing up in his test results.