WASHINGTON -- Cliff Lee threw his first pitch to Washington center fielder Denard Span with two outs and a man on second base in the bottom of the third inning Thursday night.

As soon as the Philadelphia Phillies left-hander got the ball back from catcher Carlos Ruiz, Lee threw up his arms, gestured to the third-base dugout and continued his walk from the mound area. Lee had to leave the game with a recurrence of a flexor pronator sprain, though the Phillies weathered the storm and posted a 10-4 victory on a 17-hit night that included 16 singles.

Lee, who was on the disabled list from May 19 to July 21 with a left elbow strain, acknowledged that he might have thrown his last pitch of the season. After the game, he was placed on the DL.

"It is pretty much the same thing it was before," said Lee, standing at his locker after the game. "I felt it barely warming up. It came on a little stronger the last six or seven pitches. I felt if I kept throwing something was going to snap."

Lee, with a 4-5 record and a 3.65 ERA, had struck out four of the first nine batters and gave up one hit before Antonio Bastardo took over in the third.

The Phillies scored five runs in the fourth to take a 5-0 lead.

"Obviously, I am worried about it," Lee said. "Body-wise, I felt good. I was thinking (the previous injury) was gone. I would have to say that's the case" (that his season might be over).

Phillies manager Ryne Sandberg said, "He will be evaluated (Friday) and then see a doctor here Saturday. I'm not going to make any judgments or anything. It is pretty similar to last time. He was actually throwing the ball pretty well. He felt good, his body felt good."

The Phillies bullpen came through as Justin De Fratus retired five batters without allowing a hit and rookie Ken Giles struck out Washington right fielder Jayson Werth for the final out in the seventh inning with two runners on base and the Phillies in front 7-4.

"The bullpen was big. De Fratus was really big," Sandberg said. "Giles had the big strikeout of Werth with a couple of guys on."

The offense was also big. Center fielder Ben Revere had four hits and scored twice and shortstop Jimmy Rollins and left fielder Grady Sizemore each had three hits. Rollins and second baseman Chase Utley each drove in two runs on a day the last-place Phillies did not make any deals before the trade deadline.

"Ben is just peppering the ball," Sandberg said. "He is squaring up the ball and using the whole field. We saw this last year for about six weeks. He really sets the table for the rest of the guys coming up."

Phillies right fielder Marlon Byrd, who had two hits, padded the lead to 9-4 with a two-run single in the eighth inning against reliever Craig Stammen. Sizemore added an RBI single to make it 10-4.

"You've just got to keep grinding through it," losing pitcher Gio Gonzalez said. "Hopefully, something snaps and it goes your way. Unfortunately, it was just that kind of night. Nothing was going our way, and we just had to grind through it."

Washington manager Matt Williams said, "They put 17 hits on the board, too. It was just one of those nights where things just didn't go right."

The winning pitcher was Bastardo (5-4), who faced just one batter in the third inning. Gonzalez (6-7) was tagged with the loss. It was the first time in seven games that the Washington starter did not last at least seven innings and allow two runs or fewer.

First baseman Kevin Frandsen, facing his former team, second baseman Danny Espinosa and Span also had two hits for the Nationals, who fell to 58-48.

NOTES: The Nationals gave up part of their future in an exchange for a veteran infielder when they traded Zach Walters, 24, to the Cleveland Indians for SS Asdrubal Cabrera, 28, an All-Star in 2011 and 2012, on Thursday. "He's been through pennant races, he's a terrific two-player," Washington general manager Mike Rizzo said of Cabrera. The Nationals called up RHP Blake Treinen from Triple-A Syracuse after the trade of Walters, who was on the 25-man roster. ... The scheduled starters for the Friday game are Washington RHP Doug Fister (10-2, 3.69 ERA) against Philadelphia RHP Roberto Hernandez (5-8, 4.14). ... The Phillies entered Thursday's game with 4-33 record in their last 37 games when scoring three runs or fewer. ... Thursday's game started a stretch of 18 games at home in 25 days for the Nationals.