McMahon went 2-for-4 with a solo home run in Saturday's 5-2 loss against the Brewers.
McMahon took Tobias Myers deep in the fourth inning for his 18th homer of the season. McMahon got off to a great start this season but has struggled mightily over the second half. The 29-year-old made his first All-Star game in July but has just four of his 18 homers since the break and is hitting .187/.305/.302 in that stretch.