The present study measured the impact of FL grammar instruction on developing the performance of both Egyptian and Saudi EFL freshmen in English grammar. A course of English grammar was separately taught to each group of participants covering all investigated grammar items. Data were separately collected from both groups through the instruments of pre and post tests. For this purpose, an English grammar test was constructed. Its Cronbach Alpha was .92 suggesting high reliability. One way analysis of variance (ANOVA) was conducted to determine differences in grammar performance within and between the two groups of participants in the pre and post tests. Findings showed variance in the performance of FL grammar among Egyptian and Saudi EFL freshmen. The study drew implications for the process of teaching FL grammar in the Egyptian and Saudi contexts