Nicknamed "Air Yordan", Alvarez made his MLB debut in 2019. He was unanimously named American League (AL) Rookie of the Year after posting the highest slugging percentage by a qualified rookie in history and selected as Players Choice AL Outstanding Rookie. Alvarez became known for being a clutch hitter in the Astros' 2022 postseason run. On three occasions, Alvarez hit a home run in the sixth inning or later while his team was trailing that gave them the lead. He hit the first walk-off home run in postseason history hit by a team down by multiple runs and he also hit a go-ahead home run in the 2022 World Series to secure his first championship. Alvarez won the AL MVP and Amercian League Championship Series MVP awards. In 2023, Alvarez hit his 100th career home run in his 372nd game, which set the franchise record for reaching 100 home runs in the fewest games, and was the fifth-fastest in major league history.