Minor Leagues

The Houston Astros selected Matijevic with the 75th overall selection of the 2017 Major League Baseball draft.^[8] He signed with the Astros, receiving a $700,000 signing bonus, and was assigned to the Tri-City ValleyCats of the Low–A New York-Penn League, where he began his professional career.^[9] Matijevic was promoted to the Quad Cities River Bandits of the Single–A Midwest League^[10] in August. In 59 games between the two teams, he hit .228 with seven home runs, 31 RBI, and 11 stolen bases.

Matijevic began 2018 with Quad Cities. In May, the Astros promoted him to the Buies Creek Astros of the High–A Carolina League.^[11] In 101 games between both teams, he hit .277/.350/.538 with 22 home runs and 62 RBI.^[12] He began 2019 with the Corpus Christi Hooks of the Double–A Texas League.^[13] On April 30, Matijevic received a 50-game suspension after failing a second test for a drug violation.^[14] He was selected to play in the Arizona Fall League for the Peoria Javelinas following the season.^[15]

Matijevic did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.^[16] He split the 2021 season between Corpus Christi and the Triple-A Sugar Land Skeeters, slashing .254/.341/.512 with 25 home runs and 75 RBI in 109 total games.

The Astros invited Matijevic to Spring Training in 2022. He did not make the team at the outset of the season and was assigned to Triple-A Sugar Land, who had rebranded as the Sugar Land Space Cowboys.^[17] He began the season batting .310 (13-for-42), .420 OBP, .714 SLG, 1.134 OPS, with four home runs, and 10 RBI over 11 games.

Major Leagues

After a hamstring injury to José Altuve, the Astros called up Matijevic from Sugar Land on April 20, 2022. He made his major league debut on April 22 versus the Toronto Blue Jays, as a pinch hitter in the ninth inning of a 4–3 loss. Matijevic struck out in his lone at bat. He received his first career start in the major leagues on April 27, manning first base versus the Texas Rangers.^[18] On June 19, Matijevic recorded his first major league hit, a home run, against Chicago White Sox starter Michael Kopech, which landed in the Crawford Box seats at Minute Maid Park in a 4–3 Astros' win.^[19] In the bottom of the ninth inning versus the New York Yankees on July 21, Matijevic hit a walk-off infield single with the bases loaded to score Alex Bregman for a 3–2 win .^[20]

Matijevic was optioned to the Triple-A Sugar Land Space Cowboys to begin the 2023 season.^[21] He was designated for assignment on March 30, after Corey Julks and César Salazar were added to the roster.^[22] On April 3, he cleared waivers and was sent outright to Triple-A Sugar Land.^[23] In 118 games for Sugar Land, Matijevic batted .244/.329/.441 with 16 home runs, 76 RBI, and 8 stolen bases. He became a free agent following the season on November 6.^[24]