** BofA downgrades shipping company Teekay Tankers' TNK.N shares to "underperform" from "neutral" rating
** Brokerage says a potential easing of geopolitical disruptions to pressure rates
** BofA cuts PT to $46 from $51
** 6 of 7 brokerages rate the stock "buy" or higher, 1 "hold"; their median PT is $68.50 - LSEG data
** Including session's moves, stock down ~8.5% YTD
(Reporting by Prakhar Srivastava in Bengaluru)
((Prakhar.srivastava2@thomsonreuters.com))