CLEVELAND (AP) — Shane Bieber allowed one run over eight innings, Amed Rosario had four hits and the AL Central-leading Cleveland Guardians won their seventh in a row against the Minnesota Twins, 5-1 in a doubleheader opener on Saturday.

José Ramírez hit a solo homer on his 30th birthday and Owen Miller had a two-run double for Cleveland (78-66), which has won 10 of its last 12 games. The Guardians opened a 4 1/2-game lead over the second-place Chicago White Sox (74-71) and a six-game margin ahead of the third-place Twins (72-72).

Bieber (11-8) won his third straight start, allowing four hits and walking none for the ninth time in 28 starts.

Minnesota’s Matt Wallner homered in the eighth and went 1 for 3 with a walk in his big league debut, with his parents and fiancée in attendance. The 24-year-old was the 39th overall pick in the 2019 amateur draft and played at this year’s Futures Game.

Emmanuel Clase pitched a perfect ninth.

Cleveland is 12 games over .500 for the first time since the end of the 2019 season. The Guardians clinched the season series against the Twins by winning Friday’s opener of the rare five-game series.

Minnesota dropped to 5-10 in September.

Louie Varland (0-1), a 24-year-old right-hander, made his second big league appearance following his debut on Sept. 7. He gave up four runs and nine hits in five innings.

Reliever Aaron Sanchez allowed one run in three innings.

Rosario had his fourth four-hit game of the season, including RBI singles in the third and sixth that helped build a 5-0 lead.

Ramírez homered in the first on a 421-foot drive to right, his 28th home run and 112th RBI. The All-Star moved into 11th place in franchise history with 191 homers.

Miller tacked on a two-run double in the fourth.

Right-hander Josh Winder (4-4, 3.83 ERA) was to start the second game for Minnesota and left-hander Konnor Pilkington (1-2, 4.30 ERA) was recalled from Triple-A Columbus to start for Cleveland in his 10th big league stint this year.