Investors appeared ready Tuesday to put the recent Citigroup-inspired wave of credit worries behind them, at least temporarily, as stocks were poised to open higher.

At 3:35 a.m. ET, Nasdaq and S&P futures were higher.

U.S. light crude futures were up $1.12 to $95.10 a barrel in overnight NYMEX trading.

Among stocks in the news early Tuesday: Sun Microsystems (Charts, Fortune 500), Mesa Air Group (Charts), SLM Corp. (Charts, Fortune 500) and Sony (Charts).

Stocks ended lower Monday, unable to overcome declines caused by concern over Citigroup (Charts, Fortune 500)'s announcement that it may take an additional $11 billion in writedowns because of subprime mortgage exposure.