Reigning world 100m champion Christian Coleman could face suspension after revealing Tuesday he missed a drugs test in December. The US sprint star, who only narrowly avoided being banned last year after three violations of anti-doping "whereabouts" rules, revealed details of his latest missed test in a statement on Twitter. Coleman said he had unsuccessfully challenged an Athletics Integrity Unit finding that he missed a test on December 9 2019. "And now this might result in me being suspended from other filing failures that occurred well over a year ago at this point," Coleman said. rcw/gph