(Beaverton, OR)  --  A motorcyclist is listed in serious condition following a hit-and-run crash in Beaverton.  Police say the motorcycle was westbound on Tualatin Valley Highway early yesterday morning when the driver of an eastbound truck began to turn left on Southwest 139th and struck the rider.  The suspect reportedly left the truck running and fled on foot.  Police say the suspect, 33-year-old Oscar Ottoniel Bravo Matias, was found shortly afterward and arrested.