In four games since becoming a starter, the right-hander is 3-0 with a 1.05 ERA, allowing just three runs in 25 2/3 innings.
Medlen will be looking to keep up that pace on Wednesday as the Braves try to prevent the Nationals from a three-game sweep at Nationals Park in a key National League East matchup.
Medlen cemented his spot in the rotation in his previous outing against the Padres, tossing a five-hit shutout. He also struck out six and allowed no free passes in a 6-0 Braves win.
"It's an unbelievable feeling," Medlen said after the game. "I don't even really know what to say. Overall it's another win, and we have a lot more to go."
Meanwhile, left-hander Ross Detwiler will be on the hill for the Nats after getting a win on Friday at home against the Mets. He comes into Wednesday's game having gone 3-0 with a 1.33 ERA in four starts at Nationals Park since the All-Star break.
Detwiler got off to a slow start in his last outing, allowing a two-run single to Daniel Murphy in the first inning, but he was able to retire 10 out of the next 11 hitters he faced to tally his seventh win of the season. In all, Detwiler pitched six innings and allowed three runs on six hits.
"I focused down in the zone [after the first inning]," Detwiler said about his outing. "The pitches in [the first] were up. Sinkers weren't sinking. They got good wood on the ball."
Braves: Chipper gets night off
Chipper Jones sat out Tuesday's game against the Nationals after Monday's long night of baseball in Washington D.C.
The series opener was delayed 56 minutes and then went 4 hours and 27 minutes in a 5-4 Nationals win, so Braves manager Fredi Gonzalez thought it was the right time to give Jones a break.
"I gave him a courtesy text, but I knew the answer," Gonzalez said. "I said 'How are you feeling?' 'Not good,' [he said]. That's what I thought. Give him a day, play him tomorrow. It's fine."
Nationals: Espinosa hitting stride since break
After a slow start to the season, Nats second baseman Danny Espinosa has picked things up since the All-Star break.
Espinosa is hitting .291 with seven home runs and 22 RBIs since the All-Star break, raising his overall average to .251 with 14 home runs and 46 RBIs.
"I've been going up there feeling comfortable. I've been able to trust my hands," Espinosa said. "My hands are quick enough to be able to see a pitch that I want and react to it. ... It probably keeps me a little more steady. I feel better on a day-to-day basis."
Nats reliever Henry Rodriguez, who is on the disabled list because of a lower back strain, threw a bullpen session on Tuesday and didn't report any discomfort. However, there still isn't a timetable for when he will play in a Major League game.
Jones' next hit will give him 2,704 overall and tie him with Doc Cramer (played from 1929-48) for 63rd place on the all-time hits list. After that, Jones needs seven to draw even with Hall of Famer Billy Williams for 62nd place.