Muñoz signed with the San Diego Padres as an international free agent on July 7, 2015, receiving a $700,000 bonus.[1] He made his professional debut in 2016 with the Arizona Padres of the Rookie-levelArizona League,[2] going 1–1 with a 5.49 ERA in 16 games, mostly in relief, averaging 7.3 walks per nine innings.[3]
Muñoz started 2018 with Tri-City and was promoted to the San Antonio Missions of the Double-ATexas League in late June.[5] In 24+2⁄3 relief innings pitched between the two teams, he was 2–1 with a 0.73 ERA, with 28 strikeouts and 13 walks.[3][6][7]
On July 12, 2019, the Padres selected Muñoz's contract and promoted him to the major leagues.[10] He made his major league debut that night against the Atlanta Braves, striking out one batter and walking one in one inning, with his fastball topping out at 101.9 miles per hour.[11] Muñoz earned his first career MLB save on August 29,[12] allowing an RBI double to his future bullpen coach Stephen Vogt in the ninth inning of a 5–3 win over the San Francisco Giants.[13] In 2019, his four-seam fastball was the second fastest in MLB, averaging 99.9 miles per hour (160.8 km/h).[14] He finished with a record of 1–1 in 22 games, striking out 30 in 23 innings.
On August 30, 2020, the Padres traded Muñoz, Ty France, Taylor Trammell, and Luis Torrens to the Seattle Mariners for catcher Austin Nola and relievers Dan Altavilla and Austin Adams.[18] Muñoz went back on the 60-day injured list in February 2021, continuing to recover from Tommy John surgery.[19] After four rehab appearances in the minors, he returned to make his Mariners debut in the team's last game of 2021.[3][20]
On December 1, 2021, Muñoz and the Mariners agreed to a four-year contract extension worth $7.5 million.[21] The contract included three additional team options for up to $24 million and bonuses for Muñoz based on the number of games he finishes.[1]
Muñoz returned to a setup role in 2022, working with several other relievers generally ahead of closer Paul Sewald. He had a 2–5 record and 4 saves, with a 2.45 ERA and 96 strikeouts in 65 innings.[22] His fastball averaged 100.2 miles per hour, but his slider was his most effective pitch, with batters hitting only .126 off his breaking ball. Walks, an issue for Muñoz earlier in his career, were not a concern, as he walked 6 percent of batters he faced, which was better than the MLB average.[23] Muñoz pitched in every Mariners postseason game in 2022 but, like his team, was much less effective in the American League Division Series. He pitched 2+2⁄3 scoreless innings against the Toronto Blue Jays in the Wild Card Series, picking up the series-clinching win in Game 2. In the Division Series, Muñoz allowed three runs in three innings, as the Mariners were swept in three games by the Houston Astros.[24]
Injuries slowed Muñoz to start 2023. A right deltoid strain sent him to the 10-day injured list on April 9, and shoulder inflammation kept him there until June 6.[25] Ankle surgery also stalled his offseason preparation before 2023.[26] Muñoz became a closer after Mariners dealt Sewald at the 2023 trade deadline.[27] He handled the higher leverage role well, being named the American League Reliever of the Month for August.[28] After getting two saves through the end of July, Muñoz earned 11 more after the Sewald trade.[29] He finished his second full season in the Seattle bullpen with a 4–7 record with 67 strikeouts in 49 innings over 52 games.[7]
On July 12, 2024, Muñoz was named to the All-Star Game as a replacement for teammate Logan Gilbert,[30] though Muñoz did not pitch in the game.[31] Muñoz did not allow a hit in in 12 consecutive appearances, from July 5 to August 14, breaking a franchise record[32] and yielding no runs during that streak.[33] He had a career-high 22 saves in 2024, with a 3–7 record and 2.12 ERA, striking out 77 batters in 59+1⁄3 innings.[22]
Personal life
Muñoz and his wife Wendy married in July 2022,[34] during the All-Star break. They met as teenagers when they both competed in track and field.[26] They have a pet cat, Matilda, who joins them on road trips.[35]
Wendy and Muñoz's older brother Helmond would provide Andrés with scouting reports on opposing batters. Muñoz was introduced to baseball at the age of 11 by his grandfather, Damazo. His parents are Alberto and Maria, and he has a second older brother, Miguel.[36]