The general combining ability of the 15 parents (five female + ten male) and specific combining ability of 50 crosses were estimated for 7 characters in summer tomato using a Line X Tester analysis. The results revealed that the GCA:SCA ratios were less than unity for all the characters indicating the predominant role of non-additive gene action. The general combining ability effects revealed that the parents 20/2, 20/5 and 20/6 Alcobasa were the best general combiner for fruit yield. The top four high significant positive sea effect and perse values for fruit yield per plant was shown by the crosses 20/6 Alcobasa x L-58. 20/2 Alcobasa x L-15, 20/4 Alcobasa x L-58 and 20/ 5 Alcobasa x N-2298MF6. In general high heterosis was noticed by the crosses with parents having high gca status.