Yahoo (YHOO, news, chart, volatility) calls have seen an increase in buying interest in recent trade. Shares are up 49 cents to $13.84 and recently made a run to session highs on news Google (GOOG) has ended its agreement with Yahoo. The news comes a day after Bernstein analysts told Bloomberg that they expect the deal to fall apart and that, in turn, could help set the table for a $20 per share bid for Yahoo from Microsoft (MSFT) some time in 2009.