Mastercard (MA) upgraded at Goldman from neutral to buy, Goldman Sachs said. $575 price target. Company is leveraged to strong credit and international volume.Mattel (MAT) upgraded at MKM to buy from neutral, MKM Partners said. $41 price target. Solid 2013 outlook and capital returns should accelerate. Mercury General (MCY) upgraded at Stifel from sell to hold, Stifel Nicolaus said. New regulations in California should boost claims. MetLife (MET) rated new hold at Deutsche. $38 price target. Industry will struggle in a period of low interest rates and higher unemployment. Nasdaq OMX (NDAQ) rated new neutral at Compass Point. $28 price target. Valuation call, as the stock is up 17% over the past six months. PG&E (PCG) upgraded at Jefferies to buy from hold, Jefferies said. $45 price target. Will trade in line once San Bruno proceedings are resolved. Buy rating. Qualcomm (QCOM) rated new buy at Topeka. $75 price target. Current momentum should continue in the near term. Ross Stores (ROST) upgraded at Deutsche from hold to buy, Deutsche Bank said. $66 price target. Company can continue to deliver solid growth in an uncertain environment. Sapient (SAPE) upgraded at Goldman from sell to neutral, Goldman Sachs said. $11 price target. Sales have stabilized in the core business. Synovus Financial (SNV) upgraded at KBW from market perform to outperform, Keefe, Bruyette & Woods said. $3.25 price target. DTA recapture and TARP repayment are potential near-term catalysts.