* Flawless 64 puts Matsuyama in share of lead
* Ends first round level with Van Pelt
* Woods scrambles to a 73 (Updates at end of day)
June 4 (Reuters) - Defending champion Hideki Matsuyama piled up four birdies on each nine to surge into a tie for the lead at the Memorial Tournament in Dublin, Ohio, on Thursday as Tiger Woods fought back from a messy start to open with a one-over 73.
Japanese Matsuyama, who won last year's title in a playoff with American Kevin Na, took advantage of relatively soft conditions on a calm, overcast day at Muirfield Village to fire a flawless eight-under-par 64.