Heterosis of individual characters in each cross were calculated and tested for significance by a t-test. Four crosses showed significant heterosis in yield per plant. Crosses showing heterosis in yield also showed heterosis in characters related to seedlings,mature fruits, plant growth, and fruit and seed size. Superiority over mid-parent for yield per plant ranged from 32.50% to 262.92%, and over better parent ranged from 11.74% to 195.93%. Across all characters, crosses showing the highest heterosis over mid- parent and better parent were Myanmar 2 × Mexico and Myanmar 3 × Mexico.