Walker, batting with one out, swung at the first offering from Jose Ortega (0-2) and sent a slider sailing far over the right field fence at Comerica Park.
The pitching duel featured solid outings from both starters. Pittsburgh's Jeanmar Gomez allowed three hits over seven innings while Rick Porcello went eight innings, allowing three hits and striking out 11.
Gal Gadot cast as Wonder Woman for 'Batman vs. Superman'
Benedict Cumberbatch's dramatic reading of R. Kelly lyrics is just what you need