Left-handed pitcher Jonathan Sanchez was traded from the Kansas City Royals to the Colorado Rockies for pitcher Jeremy Guthrie.
The Rockies save more than $1 million in the exchange of struggling veteran starters.
Guthrie had been in the bullpen before recently returning to the Rockies' rotation. He was 3-9 with a 6.35 ERA with Colorado and began the season with losses in nine straight decisions.
Sanchez was acquired by Kansas City in the offseason deal that sent All-Star MVP Melky Cabrera to the Giants. He was designated for assignment by the Royals Tuesday after his ERA hit 7.76 in 12 starts. Sanchez is 1-6 and allowed seven runs in 1 1/3 innings against the Mariners Monday.
Guthrie was traded to the Rockies from Baltimore in the offseason.
--The Toronto Blue Jays and Houston Astros have completed a 10-player deal that sends left-handed pitcher J.A. Happ, right-handed relievers Brandon Lyon and David Carpenter to the Blue Jays.
In return, the Astros receive outfielder Ben Francisco, catcher Carlos Perez and pitchers Francisco Cordero, Asher Wojiechowski, Joe Musgrave and David Rollins. The Blue Jays will also include a player to be named later in the trade.
To fill a roster spot created in the deal, the Blue Jays recalled Travis Snider from Triple-A Las Vegas.
--Washington Nationals general manager Mike Rizzo says he and he alone will make the decision on when to shut down pitcher Stephen Strasburg for the season.
No number of innings has been announced as the stopping point for Strasburg, who is coming off Tommy John surgery, but speculation has the limit at around 161 1/3 innings that Jordan Zimmermann, also coming off elbow surgery, was under last season before being shut down.
"It will be the eye test," Rizzo told ESPN. "(Manager) Davey (Johnson) won't decide, and ownership won't decide. It will be the general manager, and that's me.
"We'll do it my way. I have the full support of ownership on this issue. It's my decision, and I've made it. There will be no going back on the decision."
"When we signed Stephen, I made a promise to him and to his parents that I would take care of him, and that's what we are going to do. I told them we would always do what's best for him. This is a kid who has never pitched more than 123 innings in a year.
"We are looking at not only competing for the playoffs this season but also in '13, '14, '15 and beyond. Stephen is a big part of those plans, and I will not do anything that could potentially harm him down the road."
Strasburg, 24, has pitched 105 innings heading into Friday's game.
The Nationals are in first place in the NL East, and Strasburg has been a big part of the success, with his 10-4 record and 2.66 earned-run average.
--The Oakland A's placed shortstop Cliff Pennington on the 15-day disabled list with left elbow tendinitis, the club announced Friday.
Pennington is batting .197 with three home runs and 16 RBI in 82 games for Oakland.
Infielder Eric Sogard was recalled from Class AAA Sacramento to take Pennington's spot on the 25-man roster. Sogard is hitting .145 with two home runs and six RBI in 22 games through two other stints with Oakland this season.
--The Arizona Diamondbacks will cut ties with infielder Geoff Blum, the 14-year veteran announced through Twitter on Friday.
"Later today @Dbacks will announce my release. I am grateful for the opportunity I was given here. #Dbacks," Blum wrote, according to MLB.com.
Blum, 39, is hitting just .143 in 17 games with Arizona this year. He has spent much of the season on the disabled list.
Blum is in his second year with Arizona. He has also played for the Montreal Expos, Houston Astros, Tampa Bay Rays, San Diego Padres and Chicago White Sox.