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8/13/2014 7:34 P.M. ET

Werth gets cortisone shot for shoulder sprain

NEW YORK -- Nationals right fielder Jayson Werth had an MRI taken Tuesday night on his right shoulder and the results revealed an AC joint sprain. On Wednesday, he received a cortisone shot in the shoulder and will not be able to play for the next couple of days.

Werth hurt the shoulder making a catch against the Phillies last week at Nationals Park. He had the day off Saturday and was back in the lineup Sunday against the Braves. The Nationals had the day off Monday, but Werth was not in the lineup the next day.

"He should be good to go [in a couple of days]. It's one of those things where it's kind of a painful thing," manager Matt Williams said. "There is no structural damage, no issues or anything else in the pictures. The cortisone shot will calm it down to get the inflammation out of there as quickly as possible. But during the process, he can't play. He has to shut it down for a couple of days at least."

Werth has been productive for the Nationals this season, hitting .279 with 12 home runs and 63 RBIs.

With Werth out, Kevin Frandsen received the start in left field, while Bryce Harper moved over from left to right field.

Span given day off after streaks get snapped

NEW YORK -- After watching his 14 game-hitting streak and 36-game on-base streak come to an end Tuesday night against the Mets, Nationals center fielder Denard Span told manager Matt Williams that Wednesday would be the right time to take the day off. Williams had planned to give Span a day off this week anyway.

Asked if the on-base and hitting streaks got to him physically, Span said, "I don't think so. It's one of those things where you are going through it, don't realize it until it's over. When it's over, you realize how exhausted you are. You are going 100 miles an hour and you are trying to stop. You realize how far you have gone. I just felt today would be a good day to relax a little bit, probably not too long. I'm pretty sure I'll find myself in the game. Other than that, I feel good."

When he gets back on the field, Span has a personal goal he would like to reach. He would like to score 100 runs in a season. He has 71 runs scored entering Wednesday's action. He said scoring 100 runs is like a power hitter driving in 100.

"That's something that would be huge to add to the season that I've had this year," Span said.

In the meantime, with Span out, Michael Taylor received the start in center field and hit leadoff.

Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.