This study aimed to determine the relationship between teachers' professional competence and the academic performance of senior high school students in Bayuin National High School. Specifically, it examined teachers' competence in monitoring student progress and using the medium of instruction, as well as student motivation. It found that teachers were perceived to often monitor student progress and use instructional strategies. Students reported being often motivated in class. A significant relationship was found between teachers' competence and student academic performance. The study concluded that teachers should continue improving their practices while students find ways to achieve better classroom performance through motivation. It recommended that teachers maintain their commitment to teaching and that future research examine other factors related to teaching effectiveness and performance.