Red Sox reveals plan for Garrett Whitlock

Despite a series of injuries to Garrett Whitlock and a history of success in the bullpen, the Red Sox are planning to keep the 26-year-old righty in the rotation once he returns from the injured list, writes Peter Abraham of the Boston Globe. Manager Alex Cora plainly stated multiple times this weekend that the organization views Whitlock as a starter, and he pushed back on the notion that pitching on consecutive days, being ready to throw nearly everyday, warming up and sitting down without getting into a game (i.e. all the rigors that come with being a relief pitcher) would help Whitlock remain healthier.

Whitlock has a career 4.75 ERA in 55 innings as a starter compared to a 2.24 mark in 112 2/3 frames as a reliever, but he’s not yet had a lengthy audition in the rotation. Part of that is due to health issues — he had Tommy John surgery in 2020, missed time this year recovering from hip surgery, and is now with ulnar neuritis in his right arm — but the Sox remain committed to giving him an opportunity to work as a member of the starting staff.

Turning a lineup over has proven difficult for Whitlock to this point in his young career. Opponents have batted .275/.313/.363 against him the first time around as a starter, but that jumps to .272/.313/.533 on the second trip and .300/.364/.700 on the third time through (albeit, in a sample of just 22 plate appearances).

The Boston rotation currently consists of Chris Sale, Corey Kluber, Nick Pivetta, Tanner Houck and Brayan Bello. Houck, who’s also hoping to establish himself as a viable long-term rotation piece for the Sox, is the only member of that group with an ERA south of 5.00. Sale, Kluber and Bello are all north of six earned runs per nine frames in their limited 2023 work thus far. Given those struggles and the fact that Kluber (signed through ’23) and Sale (signed through ’24) are relatively short-term pieces, it makes sense to see whether Whitlock, who is signed through 2026 with a pair of club options thereafter, can eventually find his footing in a rotation setting.

One potential arm on the mend is lefty James Paxton, who could impact the starting staff sooner than later. The veteran southpaw hasn’t appeared in a Major League game since April 2021 thanks to Tommy John surgery, a significant lat strain and a more minor hamstring strain, but he’s made five rehab appearances and was particularly sharp his last time out, with 5 1/3 shutout frames and an 8-to-1 K/BB ratio. It’s a stark contrast from an April 19 rehab appearance against the Phillies’ Triple-A affiliate, where Paxton was tattooed for seven runs while only recording two outs.

MLB.com notes that Paxton will be reevaluated today to determine whether another rehab start is necessary. He’s coming up on the end of his 30-day minor league rehab window next week but would have time to make one more Triple-A outing if the organization deems it best for him.

In the lineup, the Sox have seen struggles from another hopeful long-term piece: first baseman Triston Casas, who’s hitting just .133/.283/.293 through his first 92 trips to the plate. The Athletic’s Jen McCaffrey writes that the team expects to stick with Casas at the MLB level for now, rather than sending him to Triple-A Worcester for any kind of reset. McCaffrey notes that manager Alex Cora cited Casas’ pitch recognition as a plus, despite the rocky average. Casas’ issues haven’t been chasing pitches off the plate so much as fouling off the in-zone pitches he needs to be punishing, Cora observed.

Casas currently has a 30.5% chase rate on pitches off the plate, which clocks in just shy of the 31.5% MLB average. He’s been more passive in the zone, however, with his 62.8% swing rate on pitches over the plate checking in five percentage points south of average. He’s averaging a hearty 90.7 mph off the bat when does put the ball in play and has three homers on the year, but Casas has also fanned in more than 29% of his plate appearances.

The Sox aren’t teeming with alternatives, however, particularly with Bobby Dalbec sporting a near-40% strikeout rate in Triple-A since his demotion. Veteran Justin Turner has started six games at first base for the Sox this season, so he’d presumably be in line for more work there if the team eventually decides that a minor league breather would be best for Casas.