• The Nationals have signed righty Hector Ambriz, who had been with the independent Long Island Ducks, SB Nation’s Chris Cotillo tweets. Ambriz, 30, pitched briefly for the Padres last season, spending most of the year pitching respectably out of the bullpen for Triple-A El Paso, with a 3.93 ERA, 7.0 K/9 and 2.9 BB/9. He pitched 36 1/3 innings for the 2013 Astros, posting a 5.70 ERA with 6.7 K/9 and 3.5 BB/9.
• The White Sox have outrighted right-hander Javy Guerra to Triple-A Charlotte, tweets JJ Stankevitz of CSNChicago.com. Guerra was designated for assignment Wednesday when he was activated from the disabled list. The 29-year-old made just three appearances for the White Sox this season before shoulder inflammation landed him on the DL. Guerra will use his time at Charlotte to round into the form he showed in 2014 in the White Sox’s bullpen (2.91 ERA, 7.4 K/9, and 3.9 BB/9 in 46 1/3 innings over 42 games).
• Per MLBTR’s DFA Tracker., Anthony Swarzak (Indians), Reid Brignac (Marlins), and Ronald Torreyes (Astros) remain in DFA limbo.

Additionally, the Pacific Coast League’s transactions page reveals that the Padres have released right-hander Hector Ambriz. After spending 55 2/3 innings in the Astros’ bullpen from 2012-13, the 30-year-old Ambriz saw just two innings with the Friars this year. Much of his season was spent at Triple-A El Paso, where he posted a solid 3.93 ERA with 7.0 K/9 and 2.9 BB/9 in 55 frames. He had signed a minor league deal with the Padres back in Spring Training.

TUESDAY: The Padres announced that they have designated Brooks Conrad for assignment.  In related moves, left-hander Frank Garces will be called up from Double-A San Antonio and right-hander Jesse Hahn is on his way back to San Antonio.

Conrad signed a minor league deal with the Padres in January after spending some time in Japan.  The infielder has spent the bulk of the year in Triple-A, slashing .278/.349/.529 with 18 homers in 337 plate appearances.  In a limited sample size of 34 major league appearances in 2014, he hasn’t been able to produce the same results.  For his career, Conrad owns a .200/.271/.660 line across parts of six big league campaigns.

• Pirates right-hander Wirfin Obispo has been outrighted to Triple-A Indianapolis, MLBTR’s Zach Links reports (on Twitter). The 29-year-old was designated for assignment last week when the Bucs claimed catcher Ramon Cabrera off waivers from the Tigers. In 25 2/3 innings with Indianapolis, Obispo has posted a 3.16 ERA with 8.4 K/9, though he’s posted a fairly high 4.6 BB/9 rate as well.
• Red Sox outfielder Corey Brown has been outrighted to Triple-A Pawtucket, according to the team’s transactions page. Brown, 28, was designated for assignment on Aug. 17 to create roster space for right-hander Steven Wright. He has a strong track record at Triple-A as a whole, but he scuffled a bit in 2014, posting a .226/.294/.452 batting line.
• The Yankees have signed right-hander Wilking Rodriguez, per the club’s transactions page. Rodriguez was released by the Royals after the team’s acquisition of Josh Willingham, but the 24-year-old posted solid stats between Double-A and Triple-A this season: a combined 2.36 ERA with 9.1 K/9 and 4.0 BB/9 in 26 2/3 innings. Rodriguez also made his big league debut for the Royals this year, firing two scoreless innings with one hit, one walk and one strikeout.

• The Reds have released pitcher Nick Schmidt, tweets Chris Cotillo of MLB Daily Dish. The 28-year-old lefty pitched 14 1/3 innings for Triple-A Louisville, posting a 7.53 ERA with 11 strikeouts and ten walks. He had previously pitched in the Padres and Rockies systems.
• The Indians have released pitcher Brett Brach, who had been at Triple-A Columbus, Cotillo tweets. Brach, the brother of Orioles pitcher Brad Brach, was a 10th-round pick in 2009. He spent most of the 2013 season with Double-A Akron.
• Cotillo also notes that the Mariners have released pitcher Jonathan Arias, who had made eight relief appearances for Triple-A Tacoma. He had a 9.82 ERA there, striking out ten batters and walking seven in 14 2/3 innings. Arias, 26, had posted very good strikeout numbers at several previous minor-league stops, however.
• Right-hander Hector Ambriz has accepted his outright assignment to Triple-A by the Padres, tweets MLBDailyDish.com’s Chris Cotillo. Ambriz, who was designated for assignment Thursday, could have refused the assignment and elected free agency.
• Infielder Josh Wilson has cleared waivers, tweets Jeff Wilson of the Fort Worth Star-Telegram. Wilson, who was designated for assignment by the Rangers Thursday, now has 72 hours to accept an outright assignment or elect free agency.
• Catcher George Kottaras has cleared waivers, tweets CBSSports.com’s Jon Heyman. Kottaras was designated for assignment by the Indians Tuesday and now has 72 hours to accept an outright assignment or elect free agency. The 30-year-old saw only four plate appearances during his brief stint with the Indians, but he was productive smashing a pair of solo home runs and drawing one walk. 
• There are four players currently in DFA limbo, per MLBTR’s DFA Tracker: Buddy Boshers (Angels), Maikel Cleto, (White Sox), Carlos Marmol (Marlins), and Chris Getz (Blue Jays).

Charlie Wilmoth contributed to this post.

• The Mariners have agreed to terms with reliever Mike MacDougal on a minor-league deal, Bob Dutton of the Tacoma News Tribune tweets. MacDougal, 37, had been pitching for the independent Camden Riversharks. The veteran spent 2013 at the Triple-A level and last appeared in the big leagues in 2012, struggling in seven appearances with the Dodgers.
• The Angels have released lefty Robert Carson, MiLB.com has announced. The Angels claimed him from the Mets in October, then outrighted him in March. He pitched 33 innings for the Mets in 2012 and 2013 combined, posting a 6.82 ERA with 3.5 K/9 and 3.0 BB/9. He struggled for Triple-A Salt Lake this season, posting 13 walks against nine strikeouts in 15 2/3 innings there.
• The Padres outrighted pitcher Hector Ambriz to Triple-A El Paso, although it’s not clear whether he will accept the assignment, MLB.com’s Corey Brock tweets. The Padres designated Ambriz for assignment on Thursday. He appeared in one game with them, after having spent the 2013 season with the Astros.
• The Diamondbacks have purchased outfielder Dustin Martin from the independent Sugar Land Skeeters, Chris Cotillo of MLB Daily Dish tweets. Martin, 30, also played for both Sugar Land and in the Diamondbacks organization in 2013, when he batted .295/.378/.502 in 249 plate appearances for the Diamondbacks’ Double-A Mobile affiliate.
• The Mets have outrighted infielder Omar Quintanilla to Triple-A Las Vegas, ESPN New York’s Adam Rubin tweets. Quintanilla had hit .207/.258/.241 in 31 plate appearances in the big leagues this season. The Mets designated Quintanilla for assignment on Wednesday, making room on their active roster for Wilmer Flores.

Ambriz was with the team for less than 24 hours, making one relief appearance and allowing an earned run on two hits and two walks with a strikeout in two innings of work. Ambriz was excellent in 16 2/3 innings at Triple-A this season, allowing just three earned runs and posting a 13-to-3 K/BB ratio in that time. Overall, in his big league career, the 29-year-old Ambriz has a 5.35 ERA in 106 innings between the Indians, Astros and Padres.

In a return to the team that originally drafted him, Nady batted .135/.238/.405 with three home runs in 42 plate appearances — his first taste of big league action since 2012.

The UCLA product will turn 30 early in the 2014 season. He threw 36 1/3 innings last year for the Astros, registering a 5.70 ERA on 6.7 K/9 and 3.5 BB/9. Among advanced metrics, FIP (5.66) and xFIP (4.42) were not big fans of his work, though SIERA (4.04) saw him as a serviceable arm. Ambriz has a career 5.37 mark over 104 innings in parts of three seasons.

• Longtime starting pitcher Kip Wells has retired, although he's hoping to remain in baseball now that his playing career is over, ESPN New York's Adam Rubin tweets. Wells was released by the Angels in May, and was considering retirement as of early July. The righty pitched parts of 12 seasons, suiting up with the White Sox, Pirates, Rangers, Cardinals, Rockies, Royals, Nationals, Reds and Padres, and posting a 4.71 ERA with 6.5 K/9 and 4.3 BB/9 in 1,338 1/3 career innings.
• The Astros outrighted Hector Ambriz to Triple-A Oklahoma City, according to the International League transactions page. The 29-year-old right-hander was designated for assignment over the weekend after pitching to a 5.70 ERA with 6.7 K/9 and 3.5 BB/9 in 36 1/3 innings for Houston this season.
• The Nationals released catcher Kris Watts, according to Bill Ladson of MLB.com (via Twitter).  Watts, 29, hit just .211/.342/.328 in 43 Triple-A games this year.  The former 16th-round pick is a career .250/.351/.372 hitter in 2,006 career minor league plate appearances between the Nationals and Pirates organizations.
• The Orioles announced that infielder Alex Liddi cleared waivers and has been outrighted to Triple-A.  Liddi was acquired from the Mariners along with a No. 3 international bonus slot for the M's No. 2 int'l slot.  Baltimore designated the 25-year-old for assignment last week to make a 40-man roster spot for Chris Dickerson.
• With Liddi in Triple-A Norfolk, there are two players in DFA limbo, according to the MLBTR DFA Tracker – James McDonald of the Pirates and Cody Ransom of the Cubs.

Steve Adams and Charlie Wilmoth contributed to this post.

Ambriz, 29, posted a 5.70 ERA, 6.7 K/9 and 3.5 BB/9 over 36 1/3 relief innings for Houston this season.  The righty signed a minor league contract with the Astros in June 2012 after being released by the Indians.

As shown on MLBTR's DFA Tracker, Ambriz joins nine other players in DFA limbo.  The Astros have 10 days to trade Ambriz, release him or outright him to the minors.