In his first full season in 2017, Márquez went 11-7 with a 4.39 ERA in 162 innings, notching a 1.38 WHIP and 147 strikeouts. He had the highest zone percentage of all major league pitchers, with 53.2% of his pitches being in the strike zone. He finished fifth in the National League Rookie of the Year voting.
2018
On July 11, 2018, Márquez hit his first career home run off second baseman and former teammate Daniel Descalso in a 19-2 Rockies win over the Arizona Diamondbacks. Márquez became the first pitcher to hit a home run off a position player since Mike LaCoss in 1986. On September 26, 2018, Márquez tied a major-league record by striking out the first eight batters of a game against the Philadelphia Phillies, before pitcher Nick Pivetta reached base on an error on a 0-2 pitch. Márquez also broke the franchise record for single-season strikeouts in a season which had been previously held by Ubaldo Jiménez back in 2010. Márquez had a dominant second half of the 2018 season after working a slider into his pitching repertoire. He ultimately finished with a 14-11 record and 3.77 ERA in 33 starts, with 230 strikeouts in 196 innings pitched. He had a WHIP of 1.20. His 10.561 K/9 was a new franchise record. Márquez also had a phenomenal season at the plate, hitting.300 with a home run, 5 RBIs, and a.650 OPS. He received the Silver Slugger Award as the best-hitting pitcher in the National League, becoming the first Rockies pitcher to win the award since Mike Hampton in 2002. Marquez's performance, along with the breakout season of Colorado native Kyle Freeland are widely credited with helping the Rockies reach the postseason in back to back years for the first time in franchise history.
2019
At the start of the 2019 season, the Rockies and Márquez agreed to a 5-year $43 million contract. On April 14, 2019, Márquez threw the first one-hit complete game in Rockies franchise history in a 4-0 win, yielding only a single to Evan Longoria in the 8th inning. In 2019, he started 28 games, winning 12, and had a 4.76 ERA before being placed on the injured list with right arm inflammation on August 26. Though his ERA was a full point higher than that of 2018, Marquez by and large maintained his consistency from the previous year. Additionally, Marquez's ERA was ballooned by 3 games where he was not taken out despite struggling badly; the last of which was a home game on July 15, 2019 where he gave up a career worst 11 runs in only 2.2 innings to the San Francisco Giants before he was taken out of the game.
