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Leandro Mercado has ended the first day of FIM Superstock 1000 action around Motorland Aragon with the top time as Ducati continued to dominate.

The Argentine, one of only two previous SSTK race winners in the field, leapfrogged his FP1 pace setting Barni Ducati team-mate Ondrej Jezek to put the Italian outfit up front by just over a tenth of a second.

Lorenzo Savadori headed up the chasing pack in third on the Pedercini Kawasaki, ahead of the Ten Kate-prepared Ducati of Fabio Massei, with long-time SSTK 1000 rider Matthieu Lussiana rounding out the top five.

Kyle Smith ended his first day of SSTK 1000 action in sixth place, ahead of Christoffer Bergman, while Romain Lanusse, Simone Grotzkyj and Joshua Day completed the top ten.