After reassigning outfielder Eddie Rosario to minor-league camp on Saturday in a procedural move, the Washington Nationals selected both he and outfielder Jesse Winker to the major-league roster on Sunday. Given the lack of experienced options in the outfield for the rebuilding Nationals in 2024, Rosario was signed earlier this month to give the team a stable left-field presence. He could get off to a slow start this year after going just 3-for-18 in his seven Grapefruit League games, but don't ignore the power-hitting left-hander in NL-only leagues just because in D.C. The 32-year-old veteran Puerto Rican slugger might not be much to look at against left-handers, but he did manage 21 home runs and 74 RBI in 142 games played last year for the Atlanta Braves.

New York Mets third baseman Brett Baty and infielder Zack Short have made the Opening Day roster, with designated hitter Mark Vientos and Ji Man Choi to start the year in the minor leagues. Especially with Vientos out of the picture in Queens to start the year, it's likely that Baty will receive everyday playing time for the Mets at the hot corner. The 24-year-old former first-round pick in 2019 has struggled so far in his first two major-league seasons, slashing .210/.272/.325 with 11 home runs and 39 RBI in 119 games and 431 trips to the plate. Much like Vientos, he has raked in the minors but hasn't been able to translate that success offensively to the majors. It means that Baty is going to need to perform in 2024 to avoid being put in a platoon situation at third base.

The New York Mets optioned designated hitter Mark Vientos to Triple-A Syracuse on Sunday and also told first baseman Ji Man Choi that he won't be on the team's Opening Day roster. It's a mild surprise after it was announced on Saturday that the newly signed J.D. Martinez would be starting the year on the farm to get his bat up to speed after just signing with the Mets several days ago. It pretty much kills any fantasy value the 24-year-old Vientos might have had in NL-only leagues to start the year. While Vientos won't begin the year in the big leagues, he'll almost certainly be up with the Mets at some point in 2024 once injuries hit. He was destroying Triple-A pitching in 2023 to earn a big-league call-up, but he hit just .211 (46-for-218) with nine homers and 22 RBI for the Mets in 65 games.

Oakland Athletics left-hander Sean Newcomb (knee), who has not pitched since March 20, is experiencing irritation in the left knee that he had surgery on last September, and it will put him on the 15-day injured list to begin the 2024 season. Newcomb had a 3.00 ERA in four Cactus League outings this spring and was expected to begin the year in the bullpen as the team's top lefty relief option. In addition to Newcomb, the A's bullpen is also dealing with injuries to Trevor Gott (elbow), who needs Tommy John surgery, and lefty Scott Alexander (ribs), so they could explore the free-agent market for more relief options to start the season. The 30-year-old southpaw wasn't on the fantasy radar to begin with after making just seven appearances (two starts) in his first season with the A's in 2023.

Oakland Athletics outfielder Miguel Andujar (knee) will be forced to open the season on the 15-day injured list. Andujar felt discomfort in his right leg while playing left field in a Cactus League game last week, and MRI results on Friday showed a torn meniscus in his right knee. He'll have surgery on March 27, and manager Mark Kotsay said that Andujar is looking at a recovery timeline of at least four to six weeks. It's a bummer for the A's and the 29-year-old, as he hit .357 with a 1.110 OPS and a team-high five home runs in 14 spring games. His absence to open the year now opens the door for No. 5 prospect Darell Hernaiz or non-roster spring standout Hoy Park to make the Opening Day roster. If everything goes well with Andujar's recovery, he could make his 2024 debut at some point in May.