House went 3-for-4 with a double, two runs scored and an RBI in Thursday's win over the Mets.

The rookie third baseman is still adjusting to big-league pitching, but he continues to offer occasional glimpses of his upside. House hasn't homered since July 13, and during his 25-game power drought the 22-year-old is slashing just .221/.225/.256 with a 30.3 percent strikeout rate. His minor-league resume offers hope that a turnaround will come eventually, although it might not happen until next season -- after posting a poor .655 OPS in his first taste of Triple-A in 2024, he delivered an .872 OPS in 65 games at the level this year to earn his promotion.

Alvarez will be Atlanta's starting third baseman for the rest of the season after Austin Riley (abdomen) underwent season-ending surgery, Mark Bowman of MLB.com reports.

While manager Brian Snitker suggested that in the long run Alvarez might be better suited to a utility role, the 22-year-old will get a chance to change that impression over the final month-plus of the season. Through 91 plate appearances in the majors this year, Alvarez is slashing .247/.330/.309 with zero homers or steals, but he did hit 10 home runs and steal 10 bags with an .861 OPS over 64 Triple-A contests in 2024.

Atlanta announced Thursday that Riley (abdomen) underwent season-ending core injury surgery.

Riley is expected to be ready for the start of spring training in February. The third baseman has been out since Aug. 2 and had been experiencing soreness in his abdominal area, and he was rehabbing to play again this year before suffering a setback this week. With surgery now in the rearview mirror, Riley's 2025 season is officially over, and he finished with a .260/.309/.428 slash line, 16 home runs, 54 RBI, 54 runs scored, two stolen bases and a 27:128 BB:K across 447 plate appearances. Now that he's done for the year, Riley will have missed a total of 112 games over the past two seasons.

DeJong will start at second base and bat third in Thursday's game against the Mets.

DeJong will remain in the lineup for a fourth straight game, with the Nationals having faced two lefty starters and two righty starters during that stretch. Despite his recent usage, DeJong is likely to remain limited to a part-time role against right-handed pitching, as the Nationals are expected to continue deploying Luis Garcia at second base, Brady House at third base and CJ Abrams at shortstop for the majority of those matchups.

Dodgers manager Dave Roberts said Thursday that Muncy (oblique) has started taking swings off a tee, Fabian Ardaya of The Athletic reports.

Muncy did not feel any soreness in his right oblique while swinging off a tee, as he continues to move in a positive direction with his recovery. It's not clear what the next step is for the third baseman, but he could be ready to take batting practice soon.

Karros is out of the lineup for Thursday's contest versus the Dodgers.

Karros will miss a second straight start while he deals with back tightness. He's considered day-to-day and will attempt to return to the lineup sometime over the weekend in Pittsburgh. Orlando Arcia will man the hot corner and bat eighth for the Rockies on Thursday.

Shaw is not in the lineup for Thursday's contest versus the Brewers.

Shaw slugged his 11th home run of the season in Wednesday's 4-3 victory but will get a breather in Thursday's series finale. Willi Castro will man third base and bat seventh for the Cubs.

Arcia went 1-for-2 with a walk, two RBI and two runs scored Wednesday against the Dodgers.

Arcia drew the start at third base with Kyle Karros (back) sidelined, and he's now been in the lineup twice across four games since being activated from the injured list. He drew his two RBI with a sacrifice fly and an infield single and also tallied an insurance run in the sixth inning. Assuming Karros is able to avoid the injured list, Arcia will likely shift to a bench role moving forward.

Baty went 1-for-3 with a walk and a solo home run in Wednesday's 5-4 loss to the Nationals.

Starting at third base and batting seventh, Baty took Brad Lord deep in the fifth inning to get the Mets on the board as they attempted to rally from an early 4-0 deficit. Baty has homered four times in his last eight games, hitting .370 (10-for-27) over that stretch with a steal, six runs and six RBI while seizing an everyday role in the lineup between the hot corner and the keystone.

Machado went 1-for-4 with a solo home run in an 8-1 win against the Giants on Sunday.

Machado flashed his power with a 425-foot solo blast in the third inning. The long ball was his first since July 29 -- a span of 19 games. The veteran third baseman had only four RBI during that homerless span, and the Padres could really benefit if he's able to turn things around down the stretch. Despite the recent struggles, Machado still has a healthy 21 home runs and 74 RBI on the campaign, and his .837 OPS is on pace to be his best mark since 2022.