NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Marathon Oil Corporation ( GCOM) to 'Buy' from 'Hold'. Net income at this $23.5 billion market cap, integrated oil company ascended by 71.7% to $709 million in the second quarter over the same quarter last year.

TheStreet Ratings released rating changes on six additional U.S. common stocks for September 30, 2010. In total, just two stocks were downgraded and five stocks have been upgraded by our stock model.

Second revenue at Marathon Oil jumped by 45.1% to $18.6 billion over the prior second quarter. Learn more about Marathon Oil: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

Also doing well, shares of Eaton Vance Corp ( EV) were upgraded to 'Buy' from 'Hold'. Fiscal third quarter net income increased by 33.7% to $41.8 million for the period ending July 31 compared to the year ago quarter. Over the same period, revenue grew by 19.6% to $273 million. Learn more about Eaton Vance: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

-- Reported by Kevin Baker in Jupiter, Fla.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.