LOS ANGELES Japanese stocks seesawed in opening trades Tuesday, with gains for defensive plays such as telecom shares helping support the market. The Nikkei Stock Average slipped fractionally to 9,168.82 after moving in both directions, with the Topix up 0.1%. Telecoms traded higher, led by a 1.3% gain for Softbank Corp. , while a 0.8% rise for Astellas Pharma Inc. led pharmaceuticals upward. The heavily traded tech majors were mixed, with Nintendo Co. up 2.3% after it released its 3DS XL portable game system in the U.S., while Sony Corp. rose 0.7% after a 0.4% gain overnight for its American [...]