Arizona: Free agent OF Vladimir Guerrero might work out for the Diamondbacks in the Dominican Republic in the next day or two, said GM Kevin Towers, who was leaving for the Dominican after Sunday's game. ... LHP Patrick Corbin will make his major league debut Monday after going 2-0 with a 1.67 ERA in four starts at Class AA Mobile (Ala.). RHP Josh Collmenter (0-2, 9.82 ERA) was moved to the bullpen. After going 10-10 with a 3.38 ERA in 2011, he has given up six home runs in 18 1/3 innings over four starts this year. "For us, it is: Can he get back to where he was?" manager Kirk Gibson said. "We believe we have seen improvement every time out. The results haven't been there, and that means something."
Atlanta: C Brian McCann left Friday's game after the fifth inning with a right intercostal muscle (high rib cage) strain, but he was back in the lineup after sitting out one game. McCann is 2-for-20 in his past six games. ... RH reliever Cory Gearrin was optioned to Class AAA Gwinnett (Lawrenceville, Ga.) to clear a spot for the return of RHP Tim Hudson from the disabled list. Hudson had been out following offseason back surgery. Gearrin didn't get into a game after he was called up Tuesday.
Chicago: C Welington Castillo was recalled from Class AAA (Des Moines) Iowa when C Steve Clevenger went on the disabled list on due to a right side muscle strain. With starting C Geovany Soto nursing a tight back, Castillo started Saturday and Sunday. ... RHP Chris Volstad will start Monday's series finale at Philadelphia, with RHP Jeff Samardzija getting pushed back to Tuesday at Cincinnati to get an extra day's rest.
Cincinnati: LH reliever Aroldis Chapman's scoreless ninth inning Saturday extended his shutout streak to 12 1/3 innings since the start of the season. That was the most innings thrown by any reliever in the majors who hadn't allowed a run. ... RHP Johnny Cueto lowered his ERA to 1.39 with seven shutout innings in Cincinnati's 6-0 win Saturday over Houston.
Colorado: LHP Jorge De La Rosa (Tommy John surgery in June 2011) will begin a rehab assignment and throw five innings or 65 pitches Wednesday for high-A Modesto (Calif.). He might be able to return to the majors in late May or June. ... LHP Josh Outman (right side strain) will be used in relief in his next rehab outing, a one-inning stint Monday for Class AAA Colorado Springs. He pitched in extended spring training Tuesday.
Houston: CF Jordan Schafer was the first Astros player to be ejected from a game this year after arguing a caught-stealing call in the second inning. ... 2B Brian Bixler was optioned to Class AAA Oklahoma City to make room for RHP Jordan Lyles. The Astros resisted making a move until minutes before Lyles' start Sunday, but when injured 1B Carlos Lee (sprained ankle) and RH reliever Rhiner Cruz (twisted ankle) were not deemed candidates for the disabled list, the team sent Bixler out for the second time.
Los Angeles: UT Jerry Hairston Jr. was hit in the hand by a fastball from Washington RHP Stephen Strasburg on Saturday, and he had to be removed from the game. However, X-rays were negative, and Hairston was available for duty Sunday. ... LF/1B Juan Rivera hasn't started since Tuesday because of a strained left hamstring. He appeared as a pinch hitter Saturday.
Miami: SS Jose Reyes (.205 average, .276 on-base percentage) has been dropped out of the leadoff spot to second because of his slow start. Manager Ozzie Guillen said, "When he starts swinging the bat better, we'll move him back where he belongs." ... 2B Omar Infante's tight left groin is still bothering him. However, Guillen is having a tough time keeping Infante, one of the Marlins' few consistent producers, out the starting lineup.
Milwaukee: RH reliever Mike McClendon (10.13 ERA in 5 2/3 innings) was demoted to Class AAA Nashville after three mostly ineffective relief outings. Veteran RH reliever Vinnie Chulk (0-0, 3.18 ERA in Class AAA) had his contract purchased from Nashville. .... To make room for Chulk on the 40-man roster, the Brewers transferred LHP Chris Narveson from the 15-day disabled list to the 60-day DL. Narveson, who is out for the season, will have surgery Tuesday to repair a torn rotator cuff.
New York: CF Andres Torres will be in the leadoff spot when he returns from the disabled list Monday. Torres strained his left calf on opening day, and his presence should help a team that has just six stolen bases. ... C Josh Thole's 10-game hitting streak, which ended Saturday, was the 11th longest to start a season in franchise history. Thole went 11-for-29 (.379) during his streak.
Philadelphia: 1B Ryan Howard (left Achilles tendon) was set to participate baseball activities in Clearwater, Fla., on Monday. Howard hasn't hit since having an infection treated near the surgically repaired tendon two months ago. ... 1B Jim Thome came out of Saturday's game due to lower back pain. He didn't see action Sunday, and he is day-to-day. ... LHP Cliff Lee (strained left side muscle) said he doesn't think he'll be able to start in Washington on Friday, the first day he is eligible to return from the disabled list.
Pittsburgh: RH Jeff Karstens (right shoulder inflammation) is expected to begin light throwing Monday in Bradenton, Fla. He will be eligible to come off the 15-day disabled list Thursday but should be out until mid-May. ... LF Alex Presley's 12-game hitting streak ended Sunday when he went 0-for-4. He batted .320 (16-for-50) during the streak.
St. Louis: CF Jon Jay, after sitting out six starts with a sprained right shoulder, got four hits in the weekend series and extended his hitting streak to nine games (16-for-35, .457). ... The Cardinals have won 10 of their last 13 regular-season games against the Brewers over two seasons. Counting the 2011 NL Championship Series, have 14 wins against Milwaukee over the past 19 meetings.
San Diego: RHP Tim Stauffer made his first rehab appearance for high-A Lake Elsinore (Calif.), giving up two runs on six hits in 3 2/3 innings. Stauffer opened the season on the disabled list because of an elbow strain. ... LHP Clayton Richard walked Giants C Buster Posey in the sixth Sunday, ending a stretch of 26 innings in which Padres pitchers had not issued a walk. The 104 hitters between walks was the fourth-longest run in Padres history.
San Francisco: 2B Freddy Sanchez had an MRI that showed a shoulder strain, and his rehab was put on hold again. He hopes to resuming rehabbing soon, and manager Bruce Bochy said the club is considering lessening the load to be more protective. Sanchez had played three games for high-A San Jose. ... RH reliever Steve Edlefsen was promoted from Fresno, and the Giants optioned RHP Eric Hacker to the Class AAA club. Hacker started Friday against San Diego and got the loss, allowing three runs in six innings. Edlefsen, 26, had a 1.42 ERA in six Class AAA appearances this season.
Washington: LF Bryce Harper, 19, made his major league debut Saturday. Booed during his introduction at Dodger Stadium, Harper had a double, a sacrifice fly for his first major league RBI and a good throw to home that almost caught a runner attempting to score from second base on a single. ... 1B Tyler Moore was called up from Class AAA Syracuse (N.Y.) to replace 3B Mark DeRosa, who was placed on the 15-day disabled list due to a left side strain. Moore has hit a franchise-best 69 homers in the minor leagues since 2010, including seven this year.