Juan Berenguer, a right-handed pitcher from Panama, made his Major League Baseball debut with the New York Mets. Known for his powerful fastball, Berenguer quickly gained attention on the mound. His career spanned several teams, showcasing his adaptability and skill in various pitching roles.

After his initial stint with the Mets, Berenguer moved to the Kansas City Royals. His time there was brief, and he soon found himself with the Toronto Blue Jays. It was with the Blue Jays that Berenguer began to refine his pitching technique, although he still struggled with control at times.

The Detroit Tigers acquired Berenguer, and it was here that he began to find more consistency. During his tenure with the Tigers, he contributed to the team's pitching staff, helping them secure victories with his fastball and slider combination. His efforts were part of the Tigers' successful 1984 season, which culminated in a World Series championship.

Following his time in Detroit, Berenguer joined the San Francisco Giants. His role varied between starting and relieving, but he continued to deliver solid performances. The Giants utilized his experience and ability to handle pressure situations, which proved beneficial during tight games.

Berenguer's career took another turn when he signed with the Minnesota Twins. His time with the Twins was marked by a memorable 1987 season, where he played a crucial role in their bullpen. The Twins went on to win the World Series that year, with Berenguer's contributions being a vital part of their success. His energetic personality and distinctive pitching style made him a fan favorite in Minnesota.

Later, Berenguer played for the Atlanta Braves, where he continued to serve as a reliable option out of the bullpen. His experience and leadership were assets to the Braves' pitching staff. Berenguer's final seasons in the majors saw him with the Kansas City Royals once more and the Oakland Athletics, where he wrapped up his professional playing career.

Throughout his time in Major League Baseball, Berenguer was known for his lively presence both on and off the field.