Rookie lefty Natsuki Takeuchi allowed a run over 6-2/3 innings to earn his sixth win as the Seibu Lions beat the Nippon Ham Fighters 3-1 in the Pacific League on Saturday. Takeuchi (6-2), a strong rookie of the year candidate, struck out six while allowing a walk and seven hits at Es Con Field Hokkaido near Sapporo. The Lions, who have Nippon Professional Baseball’s worst record this season at 28-59-2, were coming off a 1-1, 12-inning draw in Friday’s series opener. Fighters starter Ren Fukushima (1-3) held Seibu’s low-powered offense off the board until Sosuke Genda drew a leadoff walk and sc…