The effects of silver and oxygen pressure on the melt-growth processing of YBa2Cu3O7-x/silver (123/Ag) composite were demonstrated by employing thermal analysis and microstructural observations. As shown by DTA, Ag effectively lowers the melting, and, hence, the solidification temperatures of 123 over the entire investigated oxygen-pressure range, which is from 152 Torr (1 atm of air) down to 2 Torr. However, the melting temperature of 123 decreases while that of the excess Ag in the composite increases with decreasing oxygen pressure. This leads to a change in the solidification sequence between 123 and Ag, which, in turn, results in a significantly different Ag morphology and distribution in the melt-grown 123/Ag composites.