Strasburg left with one out in the fifth inning. Nationals general manager Mike Rizzo said the young ace would have an MRI exam Sunday in Washington.
“You’re always concerned when your pitcher leaves in the middle of the game, but we’ll see what the MRI says and we’ll react accordingly,” Rizzo said.
Strasburg made his third start since returning from a stint on the disabled list with inflammation in the back of his right shoulder. He grimaced and shook his right wrist after a pitch to Dominic Brown and was removed without any warmup tosses.
Strasburg was in control until he got hurt, striking out six in 4 1-3 innings while allowing two runs and a run.
Doug Slaten (3-1) pitched 1 2-3 shutout innings for the win.
Roger Bernadina hit a three-run homer, Ian Desmond had four hits and Ivan Rodriguez and Adam Kennedy each had two RBIs. Phillies starter Kyle Kendrick (8-6) was hit hard all night.
Cardinals 5 Giants 1: In St. Louis, Chris Carpenter outdueled Tim Lincecum , newcomer Pedro Feliz drove in two runs and the St. Louis Cardinals snapped a five-game losing streak by beating the San Francisco Giants.
Carpenter (14-4) allowed one run in 7 1-3 innings, helping the Cardinals hand Lincecum the first four-game losing skid of his career.
Lincecum (11-8) began the day with a 5-0 mark and a 1.54 ERA in five lifetime starts against the Cardinals. But the defending two-time NL Cy Young winner was tagged for four runs on six hits and two walks in 5 1-3 innings.
In his last four starts, Lincecum has allowed 28 hits and 18 runs in 19 1-3 innings.
Carpenter gave up five hits, walked two and struck out four. A trio of pitchers combined on scoreless relief.
Diamondbacks 3 Rockies 1: In Phoenix, Justin Upton hit a go-ahead home run off Colorado ace Ubaldo Jimenez in the sixth inning that sent the Arizona Diamondbacks over the Rockies.
Jimenez (17-4) lost for the third time in his last six starts despite allowing only three hits in six innings. The last-place Diamondbacks sent Colorado to its third loss in a row.
Upton had never gotten a hit in his career against Jimenez before doubling in the fourth and scoring on a wild pitch. It was 1-all when Upton connected with two outs for his 17th home run.
Barry Enright (4-2) gave up one run and three hits in 6 2-3 innings, leaving him with a 2.73 ERA. Juan Gutierrez finished for his fourth save.
Brewers 6 Padres 5: In Milwaukee, Ryan Braun hit his first homer in nearly a month and Chris Dickerson drove in two runs to lead the Milwaukee Brewers over the San Diego Padres.
San Diego’s Matt Stairs set a big league record for most career pinch-hit home runs when he connected for his 21st, a two-run shot in the eighth inning. He snapped a tie with Cliff Johnson.
Mike McClendon (1-0) pitched three scoreless innings to get his first career win. John Axford got five outs for his 19th save in 21 chances.
Kevin Correia (10-8) struggled for the Padres, who lost their second straight after winning five in a row.
Marlins 6 Astros 3: In Miami, Wes Helms hit a go-ahead run-scoring triple in the sixth and the Florida Marlins beat the Houston Astros to extend their winning streak to a season-best five games.
Cody Ross and Helms hit back-to-back triples as Florida erased a 2-0 deficit in the sixth. Ross’ triple off Astros starter Wandy Rodriguez tied it at 2, while Helms’ triple rolled past the bag at third, deep toward the foul area.
Chris Volstad (7-9) shut down the Astros after a difficult first inning.
Rodriguez (9-12) struck out 10 in six innings. The loss was his first in his last seven starts and snapped a three-game win streak.
Mets 5 Pirates 1, 5 innings: In Pittsburgh, David Wright hit a three-run homer and Jonathon Niese pitched a five-hitter as the New York Mets beat the Pittsburgh Pirates in a game called in the top of the sixth inning because of rain.
Niese (8-5) won for the first time in five starts. The victory assured New York of its first road series win against an NL team this season, though it did sweep Baltimore and Cleveland on the road in interleague play.
The Pirates lost their fifth in a row and 12th in 13 games.
Wright’s home run off James McDonald (2-3) in fifth inning landed in the Mets’ bullpen in center field and pushed the lead to 5-1.
Dodgers 8 Reds 5: In Los Angeles, Ryan Theriot , Andre Ethier , Jay Gibbons and Matt Kemp all homered in a span of just five batters against Cincinnati’s Johnny Cueto in his first start after serving a seven-game suspension, and the Dodgers snapped the Reds’ seven-game winning streak in Manny Ramirez’s long-awaited return to the lineup.
Chad Billingsley (10-7) allowed three runs and seven hits over 5 2-3 innings and struck out seven. The Dodgers had homered only four times in the right-hander’s previous nine starts combined, and totaled just eight runs over his previous six outings — including consecutive 2-0 wins over the Giants and Padres.
Jonathan Broxton , the fourth Dodgers pitcher, worked a perfect ninth for his 22nd save in 27 chances.
