Smith (6-1) struck out three over 1.2 perfect innings to earn the win Friday over the Orioles.
Smith (3-0) allowed one hit over 1.2 scoreless innings to earn the win over the Royals on Tuesday. He did not strike out or walk a batter.
Smith earned the save in Wednesday's 6-3 win over the Mets, allowing one hit while striking out two in a scoreless inning of work.
Smith (1-0) retired both batters he faced to earn the extra-inning win over the Astros on Wednesday.
Smith will begin the season in the Guardians' bullpen unless the team acquires another reliever in the next few days, Zack Meisel of The Athletic reports.
The Guardians selected Smith to their 40-man roster Tuesday.
The Guardians reassigned Smith to minor-league camp Friday.