STOCKTON — Professional mixed martial arts fighter Nick Diaz has been ordered to turn himself in to serve one day at San Joaquin County Jail on Sept. 3.Diaz, who also faces potential consequences from the Nevada Athletic Commission for alleged marijuana use, will be in County Jail custody on a conviction of driving under the influence.San Joaquin County Superior Court also has ordered Diaz to pay a fine of more than $2,000, participate in an [...]