S&P futures down 0.6%, near worst levels, after US equities came under pressure in prior session. Asian markets weaker overnight with China, Japan and Hong Kong all down over 1%. European markets softer, but pullback fairly limited. Treasuries firmer across curve, extending recent safe-haven strength. Dollar lagging again on risk-sensitive yen cross, slightly off vs euro. Gold up 0.4%. WTI crude little changed.