Martinez went 2-for-4 with a solo homer in Monday's 3-1 loss to the Royals.
Martinez has hit four of his 16 homers since returning from an elbow injury on Aug. 3. The 28-year-old slugger is starting to regain the form he showed in a 38-homer 2015 campaign, reaching base in 11-of-12 games with eight extra base hits since coming off the Disabled List.