Nicholas Menalaus MacLeod holds the record for the most games lost in a single tournament: he lost 31 games at the Sixth American Chess Congress at New York 1889, while winning six and drawing one.

In fairness to MacLeod, he was only 19 and the tournament, a 20-player double-round robin, was one of the longest tournaments in chess history. The most games lost by a player who lost all of his games in a tournament was by Colonel Moreau. A last-minute substitute for Mikhail Chigorin at Monte Carlo 1903, Moreau lost all 26 of his games.

 

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