[3] Gonsolin spent his first professional season with the Ogden Raptors and Great Lakes Loons, pitching to a combined 1–2 record with a 3.77 ERA in 19 relief appearances.

[7] On July 30, in his second MLB game, Gonsolin picked up his first career save against the Colorado Rockies after pitching four innings of relief in a 9–4 win.

[8] On August 5, Gonsolin picked up his first major league win after pitching six shutout innings against the St. Louis Cardinals.

[10] In the pandemic-shortened 2020 regular season, Gonsolin went 2–2 with a 2.31 ERA, in nine games (eight starts) during which he struck out 46 batters in 46+2⁄3 innings.

[11] In the World Series, he was selected by Dodgers manager Dave Roberts to start Game 2, on two days' rest, against the Tampa Bay Rays.

[16] Gonsolin began the 2021 season on the Opening Day roster but did not appear in a game before he was placed on the injured list on April 4 with right shoulder inflammation.

[10] After starting the 2022 season with 11 wins and no losses and a 2.02 ERA, Gonsolin was selected to the 2022 Major League Baseball All-Star Game.

[21] He spent the next month recovering and did not return until he made a start on October 3, the second to last day of the regular season.

[23] However, an ankle injury in spring training led to him beginning the season on the injured list.

[28] Gonsolin spent the 2024 season recovering from his surgery, appearing only in three rehab games in the minor leagues.