Maroth has had a losing record in each of his previous three major league seasons with Detroit, including a 9-21 mark in 2003 when Detroit lost an AL-record 119 games.
The 28-year-old left-hander has been inconsistent this season, but has pitched better lately to even his record at 13-13. He did not receive a decision in Detroit’s 5-4 loss to Kansas City on Tuesday after allowing two runs and eight hits in seven innings.
Maroth, who will try to tie injured right-hander Jeremy Bonderman for the team lead in wins, has had quality starts in four of his last five outings, and has won five of his last seven decisions
Maroth, however, has struggled against Seattle, going 2-4 with an 8.91 ERA in seven career starts.
Detroit snapped an eight-game losing streak with a 7-1 win over Seattle on Saturday.
“It’s been a tough, difficult month,” Tigers manager Alan Trammell said. “But we won, so I feel great.”
Monroe had two hits as a late addition to the lineup in place of Magglio Ordonez. Ordonez was scratched with soreness related to the sports hernia that caused him to miss the first three months of the season.
Shelton finished with three hits for Detroit, which needs four wins in its final eight games to match last year’s 72-90 record.
The Mariners fell to 3-7 on their season-high 11-game road trip.
Ichiro Suzuki went 1-for-4 Saturday, and is 2-for-18 (.111) in his last four games. He needs six more hits to reach 200 for the fifth straight year.