The Opener: Roster Expansion, Alvarez, Heaney

Here are three things we’ll be keeping an eye on throughout the day today:

1. Roster Expansion:

It’s September 1, which means MLB rosters are expanding from 26 players to 28 players. Each team in the league will be able to add one position player and one pitcher to their roster today. Various organizations will take different routes to filling those roster spots. Some will use the opportunity to promote a prospect, as the Nationals are with today’s starter Andrew Alvarez. Other clubs will dedicate those roster spots to a veteran who was available on waivers or in free agency, as the Cubs have opted to do by picking up Aaron Civale and signing Carlos Santana. While active rosters are expanding, 40-man rosters do not get extra spots in September. That means any players not already on the 40-man roster will need to be given a spot to be called up as part of today’s roster expansion.

2. Alvarez to debut:

As mentioned above, the Nationals are promoting lefty Andrew Alvarez to the big leagues for a start today. It will be the former 12th-round pick’s big league debut, coming against an as-of-yet unannounced Marlins starter. Alvarez, 26, has 25 starts at the Triple-A level this year with a 4.10 ERA and a 21.5% strikeout rate in 123 innings. The southpaw isn’t ranked within the Nationals organization’s top 30 prospects by either MLB Pipeline or Baseball America, but if Alvarez can maintain something close to his Triple-A numbers in the majors, he could join a number of young potential back-of-the-rotation arms like Jake Irvin, Mitchell Parker, and Brad Lord that the Nationals will have competing for starts next year. The Nats will need to select Alvarez’s contract to the 40-man roster before he can make this afternoon’s start.

3. Heaney to sign in NL?

The other aforementioned way many clubs will use their expanded roster spots—bringing veteran players from outside the organization into the fold—stands to potentially benefit left-hander Andrew Heaney. Heaney was designated for assignment by the Pirates last week and released after he cleared waivers, making him eligible to sign with any of the league’s 30 clubs. Heaney’s 5.39 ERA in 120 1/3 innings of work this year isn’t exactly inspiring, but clubs in need of innings could still look to the southpaw as a legitimate option.

It’s therefore unsurprising that, according to MassLive’s Chris Cotillo, one NL club is poised to bring him into the fold. While it’s unclear which team will be rostering the lefty, it’s not hard to imagine either a contending club in need of innings picking him up or even a non-contending club that wants to ease the burden on some of its young arms down the stretch. Heaney has spent the majority of his career in the AL, but has pitched for the Marlins and Dodgers previously in addition to his stint with the Pirates earlier this year.