The Cubs optioned Mastrobuoni to Triple-A Iowa on Wednesday, Taylor McGregor of Marquee Sports Network reports.

Kevin Alcantara was called up from Iowa to take Mastrobuoni's spot on the 28-man active roster. Mastrobuoni will likely finish the 2024 season with a .194/.245/.224 slash line in 50 games for the Cubs.

Cook is out of the lineup for Wednesday's game against the Brewers.

Cook will hit the bench after he went 3-for-14 with a solo home run and a stolen base while starting each of the past four games at four different positions (first base, left field, right field and center field). First base could end up being the primary home for Cook over the final four games of the season after the Pirates moved Rowdy Tellez off the 40-man roster Tuesday.

Rendon (oblique) hasn't yet been ruled out from returning this season, though Angels manager Ron Washington suggested Tuesday that the third baseman's return is unlikely, Andrew Seligman of the Associated Press reports.

Rendon last played for Los Angeles on Sept. 7. He subsequently missed two games due to what was originally diagnosed as a sore back, and despite initially being expected to be out just a few days, Rendon was eventually moved to the injured list and deemed to be suffering from a left oblique strain. Washington wouldn't entirely commit Tuesday to Rendon being done for the season, though the manager implied that will be the likely outcome, saying, "We haven't made a total decision on that yet, but we're still working through it. I think you make a common-sense deduction, you can answer that one yourself." If Rendon's season is in fact over, he'll finish with a .218/.307/.267 slash line, no home runs, 14 RBI, 21 runs and six stolen bases over 57 games. Since joining the Angels on a seven-year, $245 million contract in 2020, Rendon hasn't played more than 58 games in any of his five campaigns.

Bohm is out of the lineup for Wednesday's game against the Cubs.

Bohm appears to be receiving a routine day off after he had started each of the Phillies' last seven games following his return from the 10-day injured list Sept. 15. Kody Clemens will fill in for Bohm at third base Wednesday.

Triolo went 3-for-4 with an RBI on Tuesday against the Brewers.

Triolo has an ugly overall line this season, but since taking over a regular role at third base in the absence of Ke'Bryan Hayes (back) in mid-August, Triolo has hit .277 with seven extra-base hits across 112 at-bats. He also has four homers and three steals across 35 games in that span.

Rojas is out of the lineup for Wednesday's game against the Astros.

The left-handed-hitting Rojas will take a seat for the second day in a row while Houston sends another southpaw (Yusei Kikuchi) to the bump. Dylan Moore will spell Rojas at third base.

Vientos went 2-for-4 with a solo home run in Tuesday's 5-1 loss to Atlanta.

The 24-year-old spoiled Spencer Schwellenbach's shutout bid in the seventh inning when he drove the first pitch he saw the other way for a 346-foot homer. Vientos has had an up-and-down September, but he's racked up seven hits in the last six games, including a double and two long balls, despite striking out 11 times in 25 plate appearances. He's overall had a successful first extended look at big-league pitching, posting a .270/.328/.523 slash line with 26 home runs and 68 RBI in 107 contests this season, but the Mets may need a little more from him if they're going to hang onto a wild-card spot.

Urias went 1-for-4 with a solo home run in Tuesday's 5-3 win over the Yankees.

Urias has started at third base and hit safely in both games since he returned from an ankle injury. His defense will likely be enough to keep him in the lineup on a regular basis heading into the postseason, though he's also batting a passable .259 (21-for-81) over 29 games since the start of August. Urias is at a .252/.325/.433 slash line, 11 homers, 36 RBI, 35 runs scored and one stolen base over 283 plate appearances this season.

Schunk went 2-for-3 with a solo home run, an additional RBI and two total runs scored in Tuesday's 7-3 loss to the Cardinals.

Schunk's playing time remains inconsistent, but he has hit safely in his last six games, going 8-for-16 in that span. The infielder is up to a .228/.265/.342 slash line with two homers, five RBI, 12 runs scored and three doubles over 83 plate appearances in the majors this season. He's also struck out at a 30.1 percent rate, which has limited his effectiveness when he gets a look in the lineup.

Bregman went 2-for-4 with a solo home run in Tuesday's 4-3 win over the Mariners.

Bregman gave the Astros an early lead with his first-inning homer. He's gone deep three times over his last five games while adding seven RBI and five runs scored in that span. The third baseman is up to 26 homers this season, his most in the last five years. Bregman has added 74 RBI, 79 runs, three stolen bases and a .257/.314/.449 slash line over 143 contests this season.