Two down, one to go. The last of the flyaways is always the hardest, in many ways. Three races on three consecutive weekends means that riders never have time to heal from even the small injuries they receive each weekend, from minor falls, or the blisters on their hands. Spending many hours cloistered in aircraft flying long distance makes catching colds or flu or other respiratory diseases inevitable. Team members being cooped up together for nearly four weeks means relationships are at best strained, at worst verging on violent.
Then there's the contrast in climate. Even at its best, Phillip Island can be chilly, so traveling from there to the sweltering tropical heat of Malaysia is a physical shock. To step on a plane in the freezing cold, then step off it to be drenched in sweat is tough for people already drained from so much travel and racing. Then to race for 45 minutes in punishing heat and humidity, at a track which is physically very challenging, because of the heavy braking zones around the track. The stress, mental and physical, is enormous.
Perhaps it was that stress that caused the MotoGP series to explode at Sepang last year. Smarting from being beaten into fourth place at Phillip Island by Marc Márquez, Jorge Lorenzo, and Andrea Iannone, Valentino Rossi seized upon the theory apparently put forward by his friend and business partner Alessio 'Uccio' Salucci, that Márquez had decided to conspire against Rossi to hand Jorge Lorenzo the 2015 MotoGP title. Márquez had attempted to accomplish this by beating Lorenzo in Australia. And in the press conference at Sepang, he launched his accusations against the Repsol Honda rider.