 Playing in the 2017 Davis Cup World Group first round against the Canada Davis Cup team, Evans beat Denis Shapovalov before losing to Vasek Pospisil, the Great Britain Davis Cup team progressing to the quarter finals.Evans was banned from playing professional tennis due to testing positive for cocaine in April 2017.Evans claims that he took a relatively small amount of cocaine out of competition, but that some permitted medication he was taking was then 'contaminated' by the cocaine because he accidentally put the leftover cocaine in the pocket of his washbag, thus testing positive in-competition.