World Superbike race two took place on a 30ºC track, using the five kilometre configuration instead of the slightly longer one used by the FIA.
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Sixteen laps around the five kilometre track of Motorland Aragon, with Yamahas having a clear advantage, World Supersport took place under a clear day with none of the weather issues of Friday.
World Supersport Superpole one was delayed a few minutes by the red flag in World Superbike. Rob Hartog and Niki Tuuli were the two favourites for the top two qualifying spots in Superpole one. After unusual conditions yesterday, Yamahas held the five quickest qualifying times.
The eighteen lap World Superbike was red-flagged after three laps, after a crash involving Leon Camier, Lorenzo Savadori and Jordi Torres. Leon Camier was taken to the medical centre. Lorenzo Savadori was the only rider to make the seventeen lap restart. Vladimir Leonov missed the first start due to his bike not being ready after a crash in qualifying and didn't make the restart. PJ Jacobsen started from the back of the grid as he didn't make the sighting lap for the quick restart.
Superpole one was on a dry track with Michael Ruben Rinaldi and Eugene Laverty's replacement Davide Giugliano the quickest of the slower men going into the session.
Sandro Cortese topped the sheets ahead of Lucas Mahias, Federico Caricasulo and Randy Krummenacher as Yamaha took the top four spots in the untimed session.
In an untimed session split by a red flag, Jonathan Rea was quickest by almost half a second from Chaz Davies.
Jordi Torres was quickest in a session where it started raining before anyone put in a properly quick lap. Leon Camier was able to get himself into Superpole two, though, knocking Michael Ruben Rinaldi down into Superpole one. Marco Melandri ended the day on top, with his quickest time in the second session proving to be the overall fastest of the day.
As the weather was much more conducive to fast riding, the laptimes were significantly better than in this morning's session. Lucas Mahias looked like he would end the session quickest but was just beaten by Randy Krummenacher. Sandro Cortese, Federico Caricasulo and Jules Cluzel made it an all-Yamaha top-five, and unlike this morning, all riders were within the 107% of the fastest lap required to qualify.
As the sun came out, laptimes dropped by over ten seconds, with Marco Melandri coming out on top, ahead of Jonathan Rea, Tom Sykes and Chaz Davies as Kawasaki and Ducati continue to dominate the top spots.
With tricky conditions continuing, only the first nineteen riders were within 107% of Jules Cluzel's time with fellow Frenchman joining him as the only other rider recording a laptime under two minutes. Federico Caricasulo was two seconds off the quickest time in third place.
In the first European round of the season, with a drying track after a wet morning, Kawasaki's Jonathan Rea opens the weekend with the quickest time, over half a second quicker than Marco Melandri on the Ducati and Leon Camier on the Honda. Michael Ruben Rinaldi, a one event rider with the Aruba IT Racing junior team, was fourth quickest.
Twenty laps at high speed through an oppressive Thai heat, World Superbike's second race of the weekend would use the reverse grid set by the results of the first race at the Chang International Circuit, Buriram.
World Supersport was a seventeen lap race at the Chang International Circuit in Buriram, Thailand, on a warm and humid Sunday. The lap record was broken at least six times.
The World Superbike Saturday race was twenty laps on a 32ºC sunny day at Thailand's Chang International circuit, next door to Buriram United's "Thunder Castle" football stadium.