S&P Global Ratings raised its ratings on Nashville&Davidson County Metropolitan Government (Metro), Tenn.'s non-tax revenue debt to 'AA' from 'AA-' on sports authority debt series 2012A and B, series 2013A and B, series 2013A and B ballpark bonds, and series 2014; and to 'AA' from 'A' on convention center authority debt series 2010B. The outlook is stable. S&P Global Ratings has based the upgrade on the application of its "Issue Credit Ratings Linked To U.S. Public Finance Obligors? Creditworthiness" criteria published Jan. 22, 2018, on RatingsDirect. We rate the non-tax revenue bonds at the same level as our view of Nashville's general creditworthiness, because we believe the ability of the city to pay the obligations is closely tied