Substitute Danny Johnson rescued a late point for Walsall after a 2-2 draw.
Goals from Luke Molyneux and Billy Sharp had twice seen Doncaster take the lead.
Rovers now trail Port Vale in third place by three points, though they have a game in hand on the Valiants.
So will Rovers win automatic promotion? Here a supercomputer – produced by footballwebpages.co.uk – has predicted where Rovers will end the season.
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