MESA, Ariz. — Some things have stayed the same since the last time right-hander Jake Arrieta pitched for the Cubs, but many things have changed.
For example, the Cubs have built up their pitching infrastructure in the last three seasons to help them analyze, develop and improve their pitchers. With upgrades to research and development and the recent success of their pitching lab, it has allowed Arrieta to see different ways to get himself back on track this season.
‘‘Yeah, it interests me a lot, and there are a lot of changes for the good,’’ Arrieta said.