Johnson strikes out 7 as Arizona beats Rockies 4-2

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DENVER (AP) -- Randy Johnson pitched six solid innings and singled in a run, Adam Dunn had a double in his Arizona debut and the Diamondbacks beat the Colorado Rockies 4-2 Tuesday night.

Dunn went 1-for-3 with a walk and Chad Tracy homered for Arizona, which has won two straight after a four-game skid. The Diamondbacks acquired Dunn from the Cincinnati Reds on Monday for a minor leaguer and two players to be named.

Chris Iannetta homered and Clint Barmes had two hits for the Rockies, who have lost three straight and five of six.

Johnson (10-8) allowed two runs and five hits, struck out seven and walked one to earn his sixth win in his last seven starts. Brandon Lyon pitched the ninth for his 25th save in 30 chances.