Leake (5-2) scattered seven hits, issued just one walk and struck out five for the Reds, who followed up their 6-0 victory Friday with a second straight whitewash of their National League Central rivals.
Sam LeCure and Jonathan Broxton each fired a scoreless inning of relief and Aroldis Chapman notched his 14th save despite allowing a hit and walk in the ninth as Cincinnati corralled a fourth win in six games overall.
Pirates starter Francisco Liriano (3-2) took the hard-luck loss despite yielding just one run on four hits over six innings, striking out 11.
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