Yield, plant and seed characteristics of S2 and S3 Mundo Novo and Burbom Amarelo coffee progenies and single and double hybrids between plants of these cultivars were recorded in a field experiment located in Campinas. Some of the single hybrids were synthesized according to a chaincross design, in order to evaluate the combining ability of the mother plants. It was verified that the Mundo Novo progenies yielded, on the average, 22 per cent more ripe fruits than those of Burbom Amarelo, and that all Mundo Novo Amarelo progenies yielded less than the best Mundo Novo progeny MP 388-6-20. No significant differences among the yields of single and double hybrids and the best Mundo Novo progenies have been noticed. Single hybrids between high yielding Mundo Novo plants have shown better yielding ability than those among lower yielding ones. It has also been observed that hybrids between Mundo Novo plants outyielded those between Mundo Novo and Burbom Amarelo plants, although no significant differences have been observed. On the other hand no evidence of heterosis for the plant characteristics studied as well as for the yielding ability has been found in the analyzed hybrids.