Jeremie Guthrie was roughed up early, and their ninth inning rally ended in a double-play, as the Colorado Rockies (15-25) lost 6-4 to the Seattle Mariners (19-24) yesterday afternoon in Denver, completing Seattle’s 3-game sweep. The Rockies open a three-game series against the Miami Marlins (22-19) tonight at 5:10 MT at Marlins Park (TV: Root Sports).

The Rockies, who are 1-5 on the current homestand, were swept in a three-game series for the third time this month — May 4-6 against the Braves and May 11-13 at the Dodgers. They are 6-11 on the road and about to start a six-game trip to Miami and Cincinnati.

The Rockies went 2-for-16 with runners in scoring position yesterday and struck out 13 times, seven against starter Blake Beavan, who left after yielding a leadoff double in the sixth to Michael Cuddyer, who broke a 0-for-13 slump with three hits.

Official: Sunday’s Box Score.

Carlos Gonzalez homered in the first, his eighth of the season and first in 59 at-bats since May 2. He also doubled, and in the ninth, singled home the Rockies final run. Gonzalez leads the team in average (.304), runs scored 29 and RBIs (32).

“It’s hard to smile right now,” Gonzalez said. “It doesn’t matter what you do out there and not being able to win. It’s difficult.”

Jeremy Guthrie needed 102 pitches to plow through six innings and just 57 were strikes. He gave up six runs, four of them on three homers. The Mariners scored two in the first, aided by the Rockies defense on a double steal when second baseman Marco Scutaro made an ill-advised throw home after traveling far across the base to grab catcher Wilin Rosario’s wide throw. Guthrie also gave up a run-scoring single to Justin Smoak on a 1-2 pitch with two out in that inning.

Guthrie, who made his second start since missing 15 games with a shoulder injury, is 2-2 with a 5.55 ERA in six starts. But in three starts at Coors Field, Guthrie is 0-2 with a 9.92 ERA.

Tickets are available for the Rockie’s next home game at Coors Field vs. the Houston Astros on Monday, May 28th, and can be purchased by calling (800) 388-ROCK, or click here.