PT TOMORROW: NL West—Anyone ready to step up in ARI rotation?

Arizona Diamondbacks

The Diamondbacks began the year with essentially the same starting rotation that ended last season—i.e., one that finished with a combined 3.61 ERA, good for third best in the majors. But with Taijuan Walker (RHP, ARI) now on the shelf for the rest of the year with a torn UCL, the rotation’s depth will no doubt be tested.

Getting the first call was 27-year-old right-hander Matt Koch (RHP, ARI). Known more for his control than overpowering stuff, Koch earned a 6B rating in the Minor League Baseball Analyst while failing to crack the team’s top 15 prospects list. Koch posted an 11/2 K/BB in 14 spring innings, and went 6 innings (1 ER, 4 K, 2 BB) in his first start against the Padres, which was enough to warrant a...

Almost!

You’re just a few clicks away from accessing this feature and hundreds more throughout the year that have a singular goal in mind: Winning your league. Subscribe to BaseballHQ.com here!

Already a subscriber? Sign in here

More From PT Tomorrow

Chandler Simpson's wheels were slowed during the speedster's lengthy stolen base drought, but he's now showing signs of breaking past his slump and helping his case to stick in Tampa Bay's lineup. Plus, more from around the AL East.
Jul 7 2026 3:05am
As the Mets shake things up, new opportunities for playing time will reveal themselves. Plus: 1B in WAS; SS in ATL; SP in MIA; Nola in PHI; more.
Jul 6 2026 9:00am
This week, we take a close look at Kyle Karros's impressive June, check in on a catching prospect in San Fran, and welcome back a few old friends.
Jul 4 2026 3:06am
Josh Lowe has returned from AAA and appears to be ready to take over the CF job in Anaheim.
Jul 1 2026 3:07am

Tools