The Clonbullogue man was just over half a second off his team mate Lando Norris.
Alex Dunne finished 16th in the opening Italian Grand Prix practice session in Monza this afternoon.
Both McLaren cars struggled for pace in the opening session with Lando Norris only managing sixth place nearly a second off the pace.
Dunne was just over half a second off his championship chasing team mate.
After a disappointing debut season for Ferrari, Lewis Hamilton clocked the fastest time with Charles Leclerc in second.
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