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Chaz Davies has topped the timesheets on the first day of World Superbike Championship action at Laguna Seca as Ducati and Kawasaki set the pace in the United States.

Having been deposed late on in FP1 by the improving Kawasakis of Tom Sykes and Jonathan Rea, Davies turned the tables in FP2 by striking to the front with three minutes remaining, his lap of 1min 23.633secs around the Californian track putting him more than a tenth clear.

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Setting his fastest time early in the session, Sykes settled into second position, ahead of Davies' team-mate Davide Giugliano - who suffered a fall at turn two in the final minutes -, while dominant championship leader Rea ended the session fourth.

In only his second weekend back with the Althea Ducati team, Niccolo Canepa completed the first day inside the top five, ahead of Red Devils Aprilia duo Leon Haslam and Jordi Torres, while Randy de Puniet enjoyed arguably his strongest start to a race weekend in 2015 with eighth best, in front of Suzuki team-mate Alex Lowes.

A tough day for the PATA Honda duo, Sylvain Guintoli slipped to tenth in FP2, while Michael van der Mark faces a task to reach Superpole 2 automatically down in 14th place as he learns his way around the iconic American circuit for the first time.

As well as Giugliano, Leandro Mercado and Ayrton Badovini also suffered tumbles during the session, leaving them 17th and 12th respectively.