Taijuan Walker scratched from rehab start at AAA Tacoma with more shoulder discomfort

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Mariners top pitching prospect Taijuan Walker was scheduled to make one final rehab start on Tuesday at Triple-A Tacoma before joining the major league starting rotation. But that plan can now be torched.

MLB.com’s Greg Johns reports that Walker had to be scratched from his start at Tacoma on Tuesday night due to stiffness in his throwing shoulder — the same joint that landed him on the disabled list at the end of spring training. Johns says Walker simply “couldn’t get loose” before the outing. The talented 21-year-old will likely be flown to Seattle for tests.

Walker posted a promising 2.93 ERA, 1.196 WHIP, and 10.2 K/9 in 141 1/3 innings last season between Double-A and Triple-A, and he struck out 10 batters over five scoreless innings in a rehab outing last week.

Video: Jake Arrieta hits a 465-foot home run off of Zack Greinke

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Jake Arrieta‘s bat is in midseason form already. The Cubs’ ace swatted a solo home run to center field off of Zack Greinke in Thursday afternoon’s Grapefruit League exhibition game, his first homer of the spring.

The blast went 465 feet, according to MLB.com’s Daren Willman.

Arrieta has hit two home runs in each of the past two seasons. Madison Bumgarner (eight) and Noah Syndergaard (four) are the only other pitchers to match or exceed his output in that department.

Greinke, meanwhile, is hoping to bounce back after a miserable 2016 season. He finished with an uncharacteristic 4.37 ERA in 26 starts in his first year with the Diamondbacks.

Luis Valbuena to miss four to six weeks with a strained right hamstring

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Angels first baseman Luis Valbuena will miss the next four to six weeks with a strained right hamstring, Pedro Moura of the Los Angeles Times reports.

Valbuena, 31, signed a two-year, $15 million contract with the Angels in January and was on track to get the lion’s share of the playing time at first base. While he’s out, however, C.J. Cron will handle first base on a regular basis. When Valbeuna returns, the two will likely form a platoon.

Last year with the Astros, Valbuena hit a solid .260/.357/.459 with 13 home runs and 40 RBI in 342 plate appearances.