Montes went 1-for-4 with a three-run homer in Tuesday's 10-5 loss to the Rangers.
Miller (4-9) took the loss Tuesday, surrendering four runs on four hits and three walks over 3.2 innings against Texas. He struck out six.
Serna went 2-for-3 with two doubles, an RBI and a run scored during Tuesday's 7-5 loss to the Mets.
Alcantara (13-10) took the loss against the Mets on Tuesday, allowing seven runs on seven hits and four walks while striking out one batter in 4.1 innings.
The Mariners reinstated Milner from the family medical emergency list Tuesday.
Seattle optioned Taylor to Triple-A Tacoma on Tuesday.
The Mariners reinstated Robles from the family medical emergency list Tuesday.
Montes (hip) will serve as the designated hitter and bat eighth Tuesday against the Rangers.
Stowers is out of the lineup for Tuesday's game against the Mets.
Mack is absent from the lineup for Tuesday's game against the Mets.
