Japan's Nikkei Stock Average erased part of yesterday's gains as initial optimism about Spain's bailout request turned into anxiety over deal details. Nikkei 225 dropped 1.02% or 88.18 points and closed at 8,536.72. A slump in oil prices weighed on Japanese oil companies. JX Holdings slipped 3.1% and Inpex Corp ended 0.7% down. Europe concerns pushed the Yen above 100 mark and harmed exporters. Sony Corp fell 2% and Mazda declined 3%. On the upside Japan Tobacco added 2.1%.