The victory, coupled with San Diego’s 4-2 loss to Boston, gave Arizona a one-game lead over the Padres. The Diamondbacks have a 1½-game edge over the Los Angeles Dodgers, who come to town for the start of a four-game series today.
Davis, who is hitting .083 (2-for-24), also singled in a run as he won for only the third time in 11 starts.
Brandon Lyon escaped a bases-loaded, one-out jam in the ninth.
Melvin Mora hit his 11th homer, a solo shot to the home bullpen in left field, in the eighth off Arizona reliever Jailen Peguero.
In the second, Chris Young tripled and scored on Carlos Quentin’s sacrifice fly.
Arizona made it 5-0 in the fourth on RBI singles by Davis and Byrnes,and a sacrifice fly by Orlando Hudson. Byrnes singled home another run in the fifth, and Mark Reynolds hit a sacrifice fly in the sixth.
Trachsel allowed five runs and seven hits in four innings. He walked four and struck out three. Eleven of the 23 batters he faced reached base.
Tracy hit a solo homer in the eighth off Baltimore’s Chris Ray.
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