Oil explorers and producers ETFs led the stock market south Tuesday asFedEx ( FDX ) delivered disappointing first-quarter results and lowered its full-year outlook. Fears of inflation from QE3 and potential supply disruption from conflict in the Middle East has already been priced into the market and now traders are booking profits, DuBord added. "Energy as a sector represents a buying opportunity for investors depending on their existing exposure and risk tolerance," said Mark Martiak, senior vice president at Premier Wealth Management in New York City.