Japan's Hideki Matsuyama failed to gain any ground in the third round of the British Open on Saturday as he dropped into a share of 38th place with sole leader Rory McIlroy extending his advantage to six shots.Japan's Hideki Matsuyama failed to gain any ground in the third round of the British Open on Saturday as he dropped into a share of 38th place with sole leader Rory McIlroy extending his advantage to six shots.