In Friday night's 7-3 win, Rodriguez surrendered just one run in 6 1/3 innings against a Royals team that just scored 28 in four games against the Brewers.
"We put up five runs, and he pitches as if it's a nothing-nothing game," manager John Farrell said. "Fluidity, there's concentration, there's really quality execution. And once again, he backs up a rough outing a few days ago with a solid game here tonight."
Excluding his loss in Toronto, Rodriguez has allowed just two earned runs and fanned 26 batters in his four other starts.
Farrell also saw something else his rookie starter learned from that game.
"To not eliminate a pitch in his full mix," Farrell said. "I thought last time out against Toronto with a heavily right-handed-hitting lineup, he might have gone away from that slider on occasion, but still against those types of teams, it's important to show the third pitch.
"He incorporated that more readily here tonight."
"For me, every team is the same, because they have at-bats," said Rodriguez, who is the Red Sox's No. 3-ranked prospect. "They aren't going to beat me because they are competing, so for me, every team is the same."
Rodriguez also said the Toronto outing helped him learn to control his pitches better and hit all the corners of the strike zone.
Jordan Wilson is an associate reporter for MLB.com.