The Frenchman is hardly a household name - this will be his first grand slam quarter-final - but Murray knows him well as the pair came through the junior ranks at the same time.
And after beating Gilles Simon in the quarter-finals, Murray made a point of reminding the assembled journalists that the last time he faced Chardy, he lost.
That defeat came last year in Cincinnati, though perhaps not too much should be read into it as it came just a week after an emotionally exhausted Murray won Olympic gold.
Murray should win, and win comfortably, but there are two reasons for slight concern for British fans.
Firstly, Chardy is in sensational form, and dispatched Juan Martin del Potro - the man Murray had expected to face in the quarters - in the third round, the biggest win of his career.
Secondly, Murray is not playing his best tennis and has not been given a serious work-out in his four matches so far - four straight-set victories.
He was particularly unhappy with his performance in the third round against Ricardas Berankis but Murray usually only hits the heights when he is either in real trouble, or facing the big boys.