The Mercedes driver reached the peak of the FP1 times by 0.029s over McLaren's Oscar Piastri, as the top five were all within a quarter of a second in this weekend's opening timed session at the Monaco circuit.
Hamilton's lap was succeeded by a red flag called for debris produced by Sauber's Zhou Guanyu, who survived a brush with the barrier at Turn 1 despite losing fragments of front wing.
