"It was tough year down there," Mattheus said. "Just being in the Minor Leagues was kind of an adjustment. It was frustrating because I felt great all year, I felt healthy, I felt the ball was coming out [of my hand] really well, but the results weren't there.
"Not having the same success in the lower level was kind of shocking to me. I didn't have the answers, except going out and competing."
This will be Mattheus' third stint with the Nationals this season. He's pitched a combined 5 2/3 innings without allowing a run.
As for Taylor, he returns to the Nationals for the second time this season. Taylor had his best season in professional baseball, hitting a combined .304 with a .390 on-base percentage and a .526 slugging percentage in 110 games for Double-A Harrisburg and Syracuse.
During his first stint with the Nationals, Taylor went 3-for-18 with one home run and two RBIs.
"I learned a lot. It's the same game," Taylor said about his first stint in the big leagues. "There were a few adjustments I have to make in order to be consistent, trying to keep my timing. Not playing a lot is tough. But it's a good experience. I get a chance to learn."
In the future, Taylor wants to cut down on his strikeouts and improve in the corner-outfield spots.
"I felt good [in the outfield]," Taylor said. "I definitely feel more comfortable in center than the corners, and that is something I'm going to be working on, shagging a lot in the corners."
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.