Since being activated from the MLB Family Medical Emergency List on June 3, Tolleson has a 1.00 ERA through nine innings and has held opponents to a .107 average. Before the leave, Tolleson had a 10.12 ERA through 16 innings and was removed from the closer role May 18. He's been able to lower his ERA to 6.84.
"I feel good. The only things is, is that I'm getting hit less, there's nothing else to it," he said. "I've tweaked a few things here and there, but it was more about me just getting through it and throwing aggressively."
Tolleson has been especially effective the past two weeks, picking up two wins over his past four outings, and throwing six scoreless innings in the process. One of those wins came Monday against the Orioles when he threw 1 2/3 innings of scoreless relief, allowing just two hits.
He also threw a perfect ninth in Saturday's 10-3 win over the Red Sox.
"Confidence, whether you know it's there or not, probably has something to do with it," Tolleson said. "When you go out there time and time again and you have success, you expect those results."
Ryan Posner is a reporter for MLB.com based in Arlington.