For which team did Lance McCullers Jr. make his MLB debut in 2015?

For which team did Lance McCullers Jr. make his MLB debut in 2015? He debuted with the Houston Astros.

McCullers made his major-league debut for Houston on May 18, 2015, at age 21. He started against the Oakland Athletics at Minute Maid Park, allowing one run while striking out five in 4⅔ innings. The Astros lost 2–1, so he received a no-decision despite a promising first performance.

The promotion came after McCullers dominated at Double-A Corpus Christi. Houston moved him directly from Double-A to the majors without requiring him to pitch in Triple-A, a sign that the organization believed his electric fastball and breaking pitches were ready for major-league competition.

McCullers remained associated with Houston throughout the early part of his career and became a key postseason pitcher. He was an important member of the Astros’ 2017 championship team and earned his first All-Star selection that season. The opposing Athletics are a frequent source of confusion: they were the opponent in his debut, not his debut team.