In contrast, Jeff Samardzija, the starter in the second game, may become part of the team's past if rumored trade possibilities come to fruition within the next month.
Samardzija (2-7, 2.83) lasted five innings, pitching his final frame after a 55-minute rain delay as the Cubs dropped the nightcap 7-2. He allowed six runs (five earned) on seven hits, including two home runs. He struck out six.
"It's tough. There's no written book about rain delays and how to go about them," Samardzija said. "I felt pretty good. I'm not making excuses. You have to come out and be ready to go."
"He was very composed," manager Rick Renteria said of the 25-year-old Beeler. "He had a good pace. He kept everybody on their toes."
Beeler finally was able to exhale after his emotional debut.
"Regardless of how it goes, it's a big weight lifted off the shoulders," Beeler said. "But I am very happy. I slept very well (Friday night), actually. I had to take a few deep breaths before I went to sleep, but I slept very well."
Beeler, who collected his first major league hit in the third inning, blanked the Nationals for the first five innings before they took a 1-0 lead in the sixth.
Denard Span led off with a bunt single, but Beeler picked him off first. Anthony Rendon then doubled to left and advanced to third on John Baker's passed ball. Beeler then uncorked a wild pitch while facing Adam LaRoche that allowed Rendon to score.
In his six innings, Beeler gave up four hits while walking three batters (one intentional) and striking out six.
"He was as impressive (watching) from behind the plate as he was from the press box," Baker said.
The Nationals picked up two more runs in the eighth on Rendon's RBI triple and a sacrifice fly.
While the Nationals swept the doubleheader, the teams split the four-game series.
"I have a lot of respect for what (first-year manager) Matt Williams and his staff do," Baker said. "We kind of sneaked up on them the first two games. But they were definitely prepared to pitch (in the first game Saturday)."
In Game 2, Blake Treinen earned his first major league victory, allowing four hits over five innings.
With the score tied 2-2, the Nationals sent nine men to the plate in the fifth against Samardzija, who appeared frustrated after the delay, and scored four runs, including a Wilson Ramos' leadoff homer.
"Yeah, to give up a few hits and come out of a tie game after that (rain), and then leaving that fifth (inning) with a 6-2 game was not what you want … you usually get a little frustrated," Samardzija said.