Michael Lorenzen threw six quality innings and Salvador Perez tallied three hits and a pair of RBIs, helping the host Kansas City Royals post a 6-2 victory over the Colorado Rockies in the second half of a doubleheader on Thursday.

Lorenzen (2-3) allowed just one run on five hits, striking out seven and walking four, as the Royals won their fourth game in a row and swept the three-game series with Colorado. Kansas City took Game 1 7-4 on Thursday afternoon.

Colorado rookie Chase Dollander (1-3) allowed five runs on seven hits across 4 2/3 innings, striking out three and walking a pair. Jordan Beck, who slugged his first home run of the season in the first game of the doubleheader, launched two more solo homers in Game 2 — accounting for both Colorado runs.

Jacob Stallings and Aaron Schunk also had two hits apiece for the Rockies, who dropped their 11th game in 12 tries and fell to 1-14 away from home this season.

Perez doubled to begin the bottom of the second and scored the game’s first run on Michael Massey’s sacrifice fly.

In the third, Freddy Fermin led off with a single for Kansas City and Jonathan India walked. Fermin was later picked off by Stallings, but Vinnie Pasquantino’s RBI single doubled the Royals’ lead.

Dollander got the first two outs of the fifth, but allowed India’s double and Bobby Witt Jr.’s run-scoring single. After walking Pasquantino, Dollander surrendered Perez’s two-run double, ending his outing.

Jaden Hill replaced the Colorado starter, striking out Massey to end the frame.

The Rockies mustered their first sign of offense in the sixth, with Beck’s solo home run pulling Colorado within four runs.

In relief of Lorenzen, John Schreiber threw a perfect seventh. Daniel Lynch IV replaced Schreiber in the eighth, allowing Beck’s second homer of the game, a 425-foot solo shot to cut Colorado’s deficit to 5-2.

Kansas City tacked on an insurance run in the bottom of the eighth, as Drew Waters’ groundout plated the Royals’ sixth run.