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8/7/2014 7:56 P.M. ET

Papi scratched due to wet playing surface

ST. LOUIS -- With the rain pouring down on Busch Stadium all day, David Ortiz was scratched from Thursday's lineup against the Cardinals.

Instead, Mike Napoli, got the start at first and batted cleanup. Yoenis Cespedes moved from fourth to third in the batting order.

With no designated hitter for the three games in St. Louis, the lineup change allowed Napoli to start for the second day in a row instead of sitting twice in three days.

Boston gets the DH back on Friday for the start of a three-game series in Anaheim.

Newcomer Johnson activated; Betts back to Pawtucket

ST. LOUIS -- Exactly a week after being traded to the Red Sox, Kelly Johnson was added to the active roster.

It isn't often a player gets dealt while finishing a stint on the disabled list, but that was Kelly's fate.

The veteran utilityman was in the process of coming back from a strained left groin when the Yankees traded him to Boston for Stephen Drew.

"I'm glad to be off the DL," said Johnson. "It's always brutal to be on the DL. A lot has happened on this trip to the DL that I didn't really see coming. I'm happy to be able to be here and get on the field and be a part of the team."

To make room for Johnson on the roster, the Red Sox sent top prospect Mookie Betts back to Triple-A Pawtucket. Betts had only started two games since rejoining Boston on Aug. 1.

"He's a developing player, and in the two stints he's had here with us, you can see the improvements defensively but we didn't want to stall that development any further," said manager John Farrell.

How will the Red Sox use Johnson?

"Pinch-hit, able to play first, third, left field, so there's versatility there," said Farrell. "Kelly's aware of the role he comes in, so we'll pick those spots accordingly."

Johnson played for Farrell with the Blue Jays from 2011-12, and that staff included current Red Sox coaches Torey Lovullo and Brian Butterfield.

"That makes you feel a little more comfortable and they kind of know what you're about, but at the same time, I'm always looking to improve and try to be better," said Johnson.

Following wild start, Webster looks to bounce back

ST. LOUIS -- When No. 5 prospect Allen Webster takes the mound again on Friday night, he'll be matching pitches with one of the best pitchers in the American League in Jered Weaver.

That will require Webster being much sharper than he was Saturday against the Yankees, when he walked five batters in one inning and was out of the game before the third inning was through.

What kind of progress has Webster made between starts?

"I would say yes, he's repeating his delivery on his side day," said manager John Farrell. "We're also looking forward to seeing the adjustments that might be needed inside a given game be accomplished. That's always the challenge of bringing the bullpen [session] into the game and executing it, having the wherewithal to step off and regroup if those situations call for it and make necessary adjustments. That's where our evaluation probably stems. It's not about stuff; it's a matter of making adjustments."

The key test for Webster will be whether he can slow the game down once adversity strikes. That is what he failed to do against the Yankees.

"It's not uncommon for young pitchers that when you get into a little bit of a situation where you're trying to do more, you're trying harder to throw a strike, not necessarily in terms of velocity, but you're trying harder to throw a ball in a certain area," said Farrell. "What that leads to is being spread out a little bit more in the delivery, your arm drags. A lot of times, less is better. We do know that in his case his changeup is the one pitch that gets him back in sync from a delivery standpoint. It causes some relaxation in his delivery. And yet, that was a little bit touch-and-go for him the other day as well."

Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.