Philadelphia Phillies right-hander Roy Halladay credits Harvey Dorfman, the late, famed sports psychologist, for much of his success as a pitcher.

After he compiled a 14.73 ERA in his first two starts, Halladay went back to old e-mail conversations with Dorfman.

He is 2-0 with a 1.71 ERA in his last three starts as he gets set to face the Indians on Tuesday night at Progressive Field.

Halladay has credited an improved outlook for much of the turnaround.

"It's a way of looking at a game," he said. "It's not a mental thing. It's how you approach the game. I think coming out of Spring Training, having short outings, having some poor outings, coming back wanting to prove that I was healthy, my focus wasn't on making pitches. My focus was on trying to prove something that necessarily didn't need to be proven. So I just tried to readjust and get back to having my focus on singular pitches and working counts and simplifying. That has always been my bread and butter, and for some reason, I got away from that. I think just coming off the injuries that I had [in 2012], obviously, being under a microscope and a lot of questions being asked, I let that kind of divert my attention. Just getting back to really simplifying is what I always tried to do.

"And I feel like that's what helped me get back to where I need to be."

The New York Yankees have placed Kevin Youkilis on the disabled list with a lumbar spine sprain.

Youkilis had missed eight of New York's past nine games with the persistent back issue.

"It was just one of those things waking up, and I didn't feel right," Youkilis said. "Sometimes, after your adrenaline's gone, things occur to you. We've just got to find out what's going on."

The Miami Marlins have promoted one of their top prospects, right fielder Marcell Ozuna, for Tuesday's game against the New York Mets.

Ozuna, who was already on the team's 40-man roster, replaces slugger Giancarlo Stanton who landed on the disabled list.

The Boston Red Sox have activated Joel Hanrahan from the disabled list, but they will continue using Andrew Bailey as their closer.

While Hanrahan was on the DL with a hamstring issue, Bailey excelled and went 5-for-6 in save chances. Bailey has 20 strikeouts and a 1.46 ERA in 12 1/3 innings this season.

There is no problem with the throwing arm of Washington Nationals right-hander Stephen Strasburg, who is not expected to miss his next start.

Strasburg was examined by a doctor after Monday night's loss to the Atlanta Braves. The team said he was suffering from tightness in his forearm.

Washington general manager Mike Rizzo said Strasburg's surgically repaired right arm is "structurally perfect."

Freddy Garcia has informed the Baltimore Orioles that he will remain with the organization through May 14.

The 36-year-old had a clause in his minor league contract that would have allowed him to opt out following his most recent start.

Garcia has been sharp through five starts for Triple-A Norfolk this season, pitching to a 2.67 ERA with 21 strikeouts against two walks through 33 2/3 innings.

The Chicago White Sox have acquired Casper Wells from the Oakland Athletics in exchange for cash.

The outfielder has bounced around quite a bit this year.

After being designated for assignment by the Seattle Mariners at the end of Spring Training, he was claimed off waivers by the Toronto Blue Jays.

Following a short stint with Toronto during which he did not appear in a game, he was designated once again, this time being traded to the A's.

The Minnesota Twins traded Francisco Liriano to the Chicago White Sox last summer in exchange for infielder Eduardo Escobar and left-hander Pedro Hernandez.

Many believe Minnesota has already won the trade, but general manager Terry Ryan isn't yet ready to declare a winner.

"I don't think I can say that right now," Ryan said. "It looks great on the surface, because Liriano probably wasn't coming back. He didn't come back (to Chicago). The two guys we got are about 23 (years old). One of them (started Saturday), and the other (was) playing in the field.

"But if they go south here in about 12 games, they're in Rochester and they never resurface, you're going to say, 'Well, you should have got more for Liriano. You didn't get anything.' So I suspect in August or so I'll be able to say, 'OK, these guys are guys that are probably going to be with us for a while.' Then you say it was a decent trade."

Chicago paid $2 million for a rental in Liriano who posted a 5.40 ERA with a lot of strikeouts, but also a lot of walks in 56 2/3 innings. The White Sox did not re-sign the left-hander.

Major League Baseball is looking into a verbal altercation between Rays left-hander David Price and home plate umpire Tom Hallion over the weekend.

Price accused Hallion of shouting a curse word toward him during Tampa Bay's 8-3 win over the Chicago White Sox on Sunday.

The AL Cy Young winner thought Hallion missed a pitch and exchanged words with the plate umpire while heading to the dugout after the seventh inning.

Hallion later called Price a "liar." Price took to Twitter and disputed Hallion's version.

Stephen Strasburg insists he won't miss his next start, but the Washington Nationals right-hander is dealing with tightness in his forearm.

He was examined by a doctor after his start against the Atlanta Braves on Monday night.

"I think he's got a little tightness in his forearm," Washington manager Davey Johnson said. "So they're going to put him on some medication."

Johnson said the hard-thrower will have to show he is ready to make his next scheduled start.

Strasburg insisted he won't miss a start.

"I'm not missing my next start," he said. "I'll tell you that right now."

Strasburg had lost a career-worst four straight starts before pitching six innings and getting a no-decision. He is 1-4 with a 3.13 ERA.