Looping is an educational policy in which a teacher teaches the whole or part of the same class in consecutive years. It is advocated as one of the most useful 21st century instructional strategies. Research has reported that looping results in greater success in students' learning of some school subjects, including mathematics, sciences, languages, and social sciences, while it is also claimed to be instrumental in fostering students' appropriate behavior. However, studies on looping in higher education are scarce. Our study aimed to understand the effects of looping of a TESOL teacher educator on pre-service EFL teachers' academic achievements in TESOL education and their career preparation for EFL teaching. We designed a case study to understand the looped students' real-life experiences. The qualitative data were collected from three sources: documents, semi-structured interviews, and field notes (observation) for data and method triangulation. The data were analyzed using Williams and Moser's (2019) qualitative data coding and following phenomenological reduction, bracketing (Dornan et al., 2005), and essences (Ganeson & Ehrich, 2009). The findings showed that the looping of a proficient, experienced, and effective TESOL lecturer results in the success of undergraduate students' acquisition of TESOL skills, and in developing their readiness for career start in EFL teaching.