The Nationals recalled Ribalta from Triple-A Rochester on Wednesday, Andrew Golden of The Washington Post reports.

Washington placed Joan Adon (bicep) on the 15-day injured list in a corresponding move. Ribalta, 26, permitted three runs over two innings in two appearances with the big club earlier this month.

The Nationals placed Adon on the 15-day injured list Wednesday with a right biceps strain, Andrew Golden of The Washington Post reports.

Adon hasn't pitched in nearly a week, so it's unclear when he might have gotten injured. The right-hander has posted a 6.75 ERA and 6:4 K:BB over 10.2 frames for the Nationals this season. Orlando Ribalta was recalled from Triple-A Rochester to take Adon's spot in the bullpen.

Roberts was removed from an appearance versus the Pirates on Wednesday in the fourth inning with an apparent injury, Meghan Montemurro of the Chicago Tribune reports.

Roberts retired the final batter in the bottom of the second inning and got through a scoreless third inning. However, he gave up a home run, hit a batter with a pitch and surrendered a single in the fourth before being visited by the trainer and exiting the field. It's unclear what injury he's dealing with, but the Cubs should provide an update soon. Roberts was charged with two runs over 1.1 frames before being lifted.

Estrada allowed one hit in a scoreless inning to notch a hold against the Cardinals on Tuesday.

Estrada handled the seventh inning and needed just eight pitches to retire the side despite giving up a one-out single. The right-hander hadn't picked up a hold since July 26 prior to Tuesday, and he's had a somewhat rough August with a 6.23 ERA and 1.85 WHIP over 10 appearances, though he's also posted a 17:5 K:BB across just 8.2 frames during that span.

Jefferies (elbow) threw a live batting practice session earlier this week and is expected to begin a rehab assignment soon, Noah Hiles of the Pittsburgh Post-Gazette reports.

Jefferies has been sidelined since early July with right elbow inflammation but is finally ready to test things out in a game setting. Given the length of his absence, he figures to require a handful of rehab appearances before being considered for the Pirates' active roster.

King (3-3) allowed two runs on three hits and a walk over one inning to take the loss Tuesday versus the Padres. He did not record a strikeout.

King got the last out of the sixth inning in relief of Miles Mikolas, but he then stumbled in the seventh. Since the All-Star break, King has a 5.11 ERA and 5:3 K:BB over 12.1 innings while taking two losses and one blown save. While he is regressing, this has still been his best major-league season -- the southpaw has a 3.10 ERA, 1.24 WHIP and 32:8 K:BB across 39.1 innings while adding seven holds this year.

Stratton is expected to be sidelined for 7-to-10 months after undergoing surgery Monday to repair a patella tendon rupture in his left knee, Alex Stumpf of MLB.com reports.

Stratton suffered the injury over the weekend when he fell awkwardly into the wall while chasing down a wild pitch. Given the timeline provided, he will be a question mark for Opening Day next season.

Cubs manager Craig Counsell acknowledged Wednesday that Brown (neck) is unlikely to return from the 60-day injured list this season, Meghan Montemurro of the Chicago Tribune reports.

On the shelf since June 11 with a stress reaction in his neck, Brown resumed throwing shortly after landing on the IL, but he's been shut down on two occasions since then while continuing to experience lingering discomfort. The rookie right-hander remains at the Cubs' complex in Arizona for his rehab program, but he's not yet doing much pitching work and doesn't look like he'll be able to complete a throwing progression within the next month to put himself in position to join Chicago even as a relief option late in the season. Brown generated a 3.58 ERA, 1.08 WHIP and 64:19 K:BB over 55.1 innings spanning 15 appearances (eight starts) this season prior to suffering the injury. He should be ready to go for spring training and will have a chance to stake claim to a rotation spot.

Scott worked a perfect ninth inning Tuesday to record his 20th save of the season in a 7-5 win over the Cardinals.

The southpaw fired 10 of 15 pitches for strikes as he collected his second save since being traded to the Padres. Robert Suarez was unavailable after pitching each of the prior two days, but he's also been tagged for a run in four of his last eight appearances. If Suarez's struggles continue, Scott could get the call in the ninth more frequently over the final weeks of the season as San Diego looks to lock down a playoff spot.

Iglesias (4-1) blew the save but picked up the win in Tuesday's 8-6 extra-inning victory over the Twins, allowing one hit over 1.1 scoreless innings. He struck out two.

The Atlanta closer entered the game with two outs and the tying run on second base in the eighth inning, and Trevor Larnach dumped a single into left field to tag Iglesias with his third blown save of the season and first since May 3. The right-hander then worked a clean ninth and saw his offense erupt for four runs in the top of the 10th. Iglesias hasn't given up an earned run since June 16, a stretch of 26.1 innings in which he's delivered a 0.27 WHIP and 32:2 K:BB.