Koumei Oda boosted his chances of defending his Casio World Open title by moving into a share of the lead following a second-round seven-under 65 on Friday.

The 31-year-old, who competed at The Open at Turnberry earlier this year but failed to make the cut, picked up eight birdies while dropping one shot on the short 11th at Kochi Kuroshio Country Club to join Shigeki Maruyama with the halfway lead on 12 under.

Maruyama also carded a 65 in a second successive flawless round as the 40-year-old chases a first win on the Japan Tour since returning full-time this season.

Money leader Ryo Ishikawa shot a 66 to move into a group of six players in a share of third at 10 under.

Collated second round scores & totals (Jpn unless stated, par 72):

132 Koumei Oda 67 65, Shigeki Maruyama 67 65

134 Ryo Ishikawa 68 66, Katsumasa Miyamoto 67 67, Tetsuji Hiratsuka 67 67, Yusaku Miyazato 65 69, Shingo Katayama 66 68

136 Kaname Yokoo 69 67, Chawalit Plaphol (Tha) 68 68, S K Ho (Kor) 69 67, Kenichi Kuboya 70 66, Toru Taniguchi 68 68

137 Toyokazu Fujishima 68 69, Hiroo Kawai 69 68, Tomohiro Kondo 68 69, Takao Nogami 67 70

138 Kiyoshi Miyazato 69 69, Tetsuya Haraguchi 70 68, Toshinori Muto 70 68, Eddie Lee (Nzl) 69 69, Azuma Yano 68 70, Taichi Teshima 72 66, Jun Kikuchi 70 68, Tatsuhiko Takahashi 68 70

139 Taichiro Kiyota 69 70, Tadahiro Takayama 69 70, Ryuichi Oda 69 70, Naoya Takemoto 70 69, Yuta Ikeda 69 70, Tatsunori Nukaga 68 71, Daisuke Maruyama 70 69

140 Hirofumi Miyase 70 70, Michio Matsumura 69 71, Masaya Tomida 69 71, Brendan Jones (Aus) 69 71, Kyung-Tae Kim (Kor) 71 69, Hidemasa Hoshino 70 70, Kiradech Aphibarnrat (Tha) 70 70, Naomichi joe Ozaki 69 71, Takamasa Yamamoto 72 68, Shigeru Nonaka 70 70

141 Makoto Inoue 70 71, Shinichi Yokota 72 69, Mamo Osanai 72 69, Hidemichi Tanaka 69 72, Taro Hiroi 72 69, Akio Sadakata 71 70, Kiyoshi Murota 71 70, Dinesh Chand (Fij) 70 71, Paul Sheehan (Aus) 71 70

142 Jeppe Huldahl (Den) 73 69, Nobuyuki Okuwa 71 71, Toru Suzuki 71 71, Ryutaro Nagano 71 71, Hiroshi Iwata 70 72, Hideto Tanihara 72 70, Nobuhiro Masuda 71 71, Kazuhiko Hosokawa 73 69, Masahiro Kuramoto 70 72, Han Lee (USA) 71 71, Hyung-tae Kim 71 71, Masashi Ozaki 70 72, Yudai Maeda 71 71, Shintaro Kai 71 71, Daisuke Kataoka 72 70

-------------------The following players failed to make the cut------------------

143 Taihei Sato 71 72, I j Jang (Kor) 71 72, Nobuhito Sato 72 71, Takashi Kanemoto 72 71, Katsunori Kuwabara 74 69, Masao Nakajima 70 73

144 Ryoken Kawagishi 71 73, Sushi Ishigaki 73 71, Jong-Duck Kim (Sin) 73 71, Atushi Yagi 74 70, Norio Shinozaki 72 72, Shinichi Akiba 71 73, Wayne Perske (Aus) 73 71, Masanori Kobayashi 75 69, Takeshi Kajikawa 74 70, Masamichi Uehira 75 69, Yosuke Mizobuchi 72 72, Hyung-sung Kim (Kor) 74 70

145 Craig Parry (Aus) 73 72, Kazuhiro Yamashita 73 72, Yuki Ishikawa 73 72, Masamichi Ito 74 71

146 Kouki Idoki 74 72, Frankie Minoza (Phi) 69 77

147 Yoshinobu Tsukada 75 72, Yui Ueda 73 74, Yuji Igarashi 76 71, Taigen Tsumagari 73 74, Toshimitsu Izawa 69 78, Takuya Taniguchi 76 71

148 Mitsuhiro Tateyama 76 72

149 Kunihiro Kamii 75 74, Satoru Hirota 74 75

154 Prom Meesawat (Tha) 80 74, Naoya Sugiyama 78 76

159 Takuya Seo 82 77