GAVIN FLOYD, recently returned from Tommy John surgery, pitched six scoreless innings last night before leaving with a broken bone in his pitching elbow, the latest setback for an injury-riddled Atlanta Braves' rotation and one that tempered a 3-0 victory over the host Washington Nationals.

The Braves said that Floyd broke the olecranon, the bony tip of the ulna that sticks out behind the elbow. Floyd will return to Atlanta today to be examined by team doctors and to determine how long he will be sidelined.

Floyd flexed his pitching arm awkwardly after giving up a long foul ball to Jayson Werth on the first pitch of the seventh inning. Floyd then left the game for reliever Anthony Varvaro.

Floyd (2-2) was making his ninth start since returning from Tommy John surgery, but manager Fredi Gonzalez said the two injuries are not related.

He had been working on a two-hit shutout. He needed only 64 pitches to get through six innings, walking one and striking out six to outduel Jordan Zimmerman (5-4).

The win moved the Braves within a half-game of the first-place Nationals atop the NL East as the division rivals opened a four-game series. Atlanta had been trending downward recently, losing eight of 12 entering the series.

Chris Johnson drove in all three of the Braves' runs, two on a bases-loaded single in the fourth and another on a line drive off reliever Jerry Blevins' left knee in the eighth.

In other NL games

* At Miami, Zack Wheeler (3-7) tossed his first shutout and made David Wright's first-inning home run hold up in the New York Mets' 1-0 victory over the Marlins.

* At Pittsburgh, Russell Martin drew a bases-loaded walk from Tony Cingrani with two outs in the 12th inning to as the Pirates avoided a three-game sweep with a 4-3 victory over Cincinnati.

Devin Mesoraco had hit a solo homer off Pirates closer Jason Grilli with one out in the ninth, tying it at 3.

* At Phoenix, Yovani Gallardo (5-4) outpitched Chase Anderson (5-2) in seven strong innings, and Carlos Gomez extended his hitting streak to 15 games as Milwaukee beat the Arizona Diamondbacks, 4-1.

In AL games

* At Cleveland, Nick Swisher's two-out grand slam off Ernesto Frieri in the 10th inning gave the Indians a 5-3 win over the Los Angeles Angels.

* At New York, Carlos Beltran drove in two runs to lead the Yankees to a 6-4 win over the Toronto Blue Jays.

* At St. Petersburg, Fla., Chris Archer (4-4) held Hosuton to three hits in 6 2/3 innings, Kevin Kiermaier and Evan Longoria homered on consecutive pitches, and the Tampa Bay Rays beat the Astros, 5-0.

* At Detroit, Anibal Sanchez (4-2) pitched seven sharp innings, and the Tigers ended Kansas City's 10-game winning streak, 2-1. J.D. Martinez hit a homer in the fourth for the Tigers, who pulled within a half-game of the AL Central-leading Royals.

In an interleague game

* At San Diego, rookie Jesse Hahn (2-1) pitched seven strong innings and pinch-hitter Chris Denorifa singled in the go-ahead run in a four-run seventh as the Padres rallied for the second straight game to beat the Seattle Mariners, 4-1.

Noteworthy

* Toronto placed lefthanded reliever Brett Cecil on the 15-day disabled list with a strained left groin and recalled righthander Steve Delabar from Triple A. Both were All-Stars last season.

In other news, infielder Brett Lawrie was out of the lineup against the Yankees after getting hit on the back of his left hand by a pitch Wednesday. X-rays were negative but manager John Gibbons said Lawrie's hand was swollen and he couldn't grip a bat. "He needs a day," Gibbons said.

Also, the Blue Jays announced that minor league lefty Ricky Romero had season-ending surgery on his left knee to clean out quadriceps tendon inflammation. Romero was an All-Star in 2011.

* Washington slugger Bryce Harper showed plenty of pop as he resumed on-field batting practice for the first time since undergoing ligament surgery on his left thumb last month. Manager Matt Williams said Harper will begin a minor league rehab assignment after the Nationals begin a road trip next week. Harper said he wants to spend eight or nine games in the minors to really push his thumb before returning to the big-league club.

* Major League Baseball and the players union are teaming to launch a new summer league in Puerto Rico to give island teenagers more chances to stay on the field during the school break. The numbers of local players making it to the big leagues has steadily diminished in recent years. There were 11 Puerto Rican players on Opening Day rosters this season. In 2005, there were 34.