An increasingly overcast FP4 saw a diverse assortment of tyres being sampled and the battle for top spot was back to a familiar picture, with Fabio Quartararo and Pecco Bagnaia swapping seats at the top of the timesheets. Despite not fully enjoying his time on the hard rear tyre, with a small moment leading him into the infamous gravel of the final chicane, Quartararo was still quick enough to claim the session at the chequered flag by one tenth of a second, after showing off his consistent pace on both the hard and medium tyre. An equally rapid Bagnaia settled for second, ahead of teammate Jack Miller, with FP3 leader Aleix Espargaro dropping to fourth, under four tenths off the lead and with solid pace despite a small front end moment of his own at turn five.
The KTMs got in the mix as well, with Miguel Oliveira climbing as high as fifth, just ahead of the Ducatis of Jorge Martin and Enea Bastianini, with Maverick Viñales eighth, half a second off top spot. Brad Binder and Luca Marini rounded out the top 10 placements, while the Suzukis of Joan Mir and Alex Rins kept close behind. After starting the session as strong as in FP3, top Honda man Takaaki Nakagami slid down the timing screens and ended the session 15th, eight tenths off the lead, in between the Ducatis of Johann Zarco and Marco Bezzecchi.
|17||49||Fabio Di Giannantonio||Ducati||1:33.611||1.133||0.050|