Mastercard (MA) earnings top estimates and Sam Vadas says it reveals a "stronger consumer." She adds that the credit card company's raised guidance could also signal Visa (V) guidance coming in "more conservative." Then, Sam switches gears and examines the leap higher for Carvana (CVNA) as shares jumped more than 20% at the open. Also on the move: EBAY. The e-commerce name leads the S&P 500 (SPX) in early action following a beat on earnings and guidance. Among laggards, Sam looks at Qualcomm (QCOM) as investors are more cautious on the chipmaker's report.