Rockies turn to prospects Alex White, Christian Friedrich amid rotation struggles

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Colorado’s starting pitchers have combined for an NL-worst 5.75 ERA, so the Rockies are calling up a pair of prospects to join the rotation.

Alex White, who was acquired from the Indians along with Drew Pomeranz in the Ubaldo Jimenez trade last season, will start tonight. Christian Friedrich, who was the 25th overall pick in the 2008 draft, will make his big-league debut tomorrow night.

White got knocked around in his first taste of the majors last season, posting a 7.01 ERA while serving up 15 homers in 51 innings, but the 23-year-old right-hander’s numbers in the minors have consistently been very impressive. He’s posted a sub-3.00 ERA at every stop, including a 2.42 ERA and 49/13 K/BB ratio with just one homer allowed in nine starts at Triple-A.

Friedrich’s minor-league numbers aren’t so pretty, as his ERA was above 5.00 both last season and in 2010, but his secondary numbers have remained strong and the 24-year-old left-hander posted a 3.00 ERA and 27/4 K/BB ratio in 30 innings at Triple-A to earn the call-up.

Zac Rosscup throws immaculate inning, lands on DL

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A day after throwing an immaculate inning — getting through an inning on three consecutive strikeouts with nine pitches — against the Mariners, Dodgers reliever Zac Rosscup was placed on the 10-day disabled list with a left calf strain. The move made room on the 25-man roster for Kenley Jansen, who is back after missing some time due to an irregular heartbeat.

Rosscup pitched the ninth inning of Sunday’s 12-1 win over the Mariners. He struck out Kyle Seager, Ryon Healy, and Cameron Maybin on three pitches each. Rosscup is the fourth pitcher to throw an immaculate inning this season, joining Kevin Gausman, Max Scherzer, and German Marquez. 2018’s four immaculate innings is still far behind 2017’s record of eight.

Rosscup has pitched only 6 2/3 innings in the majors this year. He has yielded five runs (all earned) on seven hits and a walk with 10 strikeouts. He missed a significant amount of time earlier this season due to a blister on his left middle finger.