Background: Leaderboards are a highly popular gamification component used in student learning to enhance motivation, attentional engagement, and learning performance. However, few studies have examined the effects of individual leaderboard elements on English vocabulary learning through video lectures. Objectives: The present study aimed to examine how different leaderboard elements (i.e., points and rank) may affect students' English vocabulary learning through video lectures. Methods: A total of 34 students were assigned to groups using different leaderboard elements in a counterbalanced order. Participants' motivation, eye movements, and learning performance were measured and analysed. Results and Conclusions: Students' leaderboard rank was shown to increase their motivation regardless of whether other elements were present. Eye movement tracking revealed that the presence of the leaderboard increased students' saccades between the questions and the options, and lengthened their dwell time on the learning materials while reducing their dwell time on the non-learning-related screen areas. Presenting students' rank alone also improved their learning performance. Implications: Our findings strongly support the use of video lectures for English vocabulary learning, with the following recommendations: (1) Instructors should present students' rank on the leaderboard to enhance students' motivation and engagement; (2) Instructors should present only the students' rank on the leaderboard to also enhance students' learning performance.