ATLANTA -- Kris Medlen has been ready to put Thursday night's fourth inning behind him since ... well, since he left the game with the bases loaded and none out in the inning.

Sunday afternoon's bullpen session should allow him to do that.

Medlen threw a normal session prior to the start of the Braves' series finale with the Blue Jays and came out of it ready to move forward.

"I think it was all internal, mental-type stuff. Today I made some adjustments," Medlen said.

He then added with a laugh: "And I definitely would not like to talk about the other day ever again."

Just to recap one last time, Medlen got through the first three innings of his Major League debut against the Rockies allowing only one run on two hits, walking three and getting through a 1-2-3 third. But suddenly, the 23-year-old missed the strike zone with 15 of his next 18 pitches.

The rookie described it as "the wheels falling off." Braves manager Bobby Cox was more concerned with the sudden fall-off in velocity.

"I didn't know if his arm was bothering him," recalled Cox early Sunday afternoon. "That's what concerned me. His velocity went down really low, and I thought there was something wrong."

After a look at some film, the problem appears to have been straightened out and Medlen expects to be under control again -- the kind of control that saw him walk only 10 batters in 37 2/3 innings, while going 5-0 with a 1.19 ERA at Triple-A Gwinnett.

"When I got in trouble, it was something on the film that I could see," Medlen said. "I was just pulling off, getting out too early -- adrenaline, nerves, whatever you want to call it. [I was] just really anxious just getting out way too early, and my arm wasn't catching up and then I tried to adjust and I was cutting the ball. It was just a snowball effect. Today, it was good, everything was down, everything was located."

With all questions about what happened satisfactorily answered, the next question is what happens next.

That will be a Tuesday night start in San Francisco's AT&T Park against 2008 National League Cy Young Award winner Tim Lincecum.

"That's going to be pretty cool," said Medlen, who expects to have friends and family in both San Francisco and Arizona on the Braves' road trip. "I'm just looking forward to getting back out there and getting back to what I was doing down in Gwinnett, just being successful throwing strikes."