FILE PHOTO: Tennis - Laver Cup - 02 Arena, London, Britain - September 24, 2022 Team Europe's Roger Federer in action during his doubles match with Rafael Nadal against Team World's Jack Sock and Frances Tiafoe REUTERS/Dylan Martinez/File Photo
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NEW YORK (Reuters) -Swiss tennis great Roger Federer said on Tuesday that anti-doping authorities have questions to answer about a perceived double standard applied to world number one Jannik Sinner after he dodged a suspension despite two positive tests earlier this year.
