By Mark Lamport-Stokes PACIFIC PALISADES, California (Reuters) - Boosted by a victory in his last PGA Tour start, Hideki Matsuyama will have to make do with limited preparation for this week's Northern Trust Open after struggling with flu-like symptoms. The 23-year-old Japanese played just nine holes at the Riviera Country Club on Wednesday and was unable to practise at all on Tuesday, spending most of the day resting. "I'm on medication now and all I can do is rest and drink lots of liquids," Matsuyama, a double winner on the PGA Tour who is one of the game's most exciting prospects, told reporters via an interpreter. More...