Μετάφραση - Τουρκικά-Αγγλικά - Bir gün çarşıda gezerken gözüme bir karpuz...

gözüne çarpmak (takılmak) to catch one's eye

or draw the attention, attract the attention, greet the eye, leap to the eye,

so instead of "I saw" you should choose one of them up there..