OAKLAND, Calif. (AP) -- Adam Dunn provided instant pop for the struggling Athletics, hitting a towering, two-run homer in his first at-bat for Oakland to highlight a 6-1 win over the Seattle Mariners on Monday in a matchup of playoff contenders.

Acquired a day earlier in a trade with the Chicago White Sox, Dunn became the 12th player in Oakland history to homer in his first at-bat with the team.

Dunn homered during a five-run first inning. His drive was a welcome sight for a team that just got swept in a four-game series by the AL West-leading Los Angeles Angels and was shut out for 29 straight innings.

Dunn went 2 for 3 batting cleanup as the designated hitter. He provided a nice lift for an Oakland offense that has struggled since dealing Yoenis Cespedes to Boston for Jon Lester on July 31.

Dunn's 461st career home run tied him for 35th place all-time with Red Sox slugger David Ortiz.

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