Guo Si
The Records of the Three Kingdoms and Annotations to Records of the Three Kingdoms contain two instances of single combat between generals. In 192, after Dong Zhuo had been murdered, Li Jue and Guo Si formed an army to oust Wang Yun and Lü Bu from Chang'an. When Guo Si approached the city from the north, Lü Bu opened the gate and offered to settle the matter by single combat. Guo Si agreed and engaged with Lü Bu, who pierced Guo Si with his lance. Guo Si's men came forth, saving their general, and both sides withdrew. Another instance of individual combat occurred between Taishi Ci, then serving under Liu Yao, and Sun Ce. Taishi Ci was on a mission accompanied by only a single horseman when he met Sun Ce, who had 13 other men with him. Taishi Ci charged at Sun Ce and the two sides clashed in single combat. Sun Ce pierced Taishi's horse and managed to grab hold of his halberd while Taishi removed Sun's helmet. When their respective reinforcements showed up, they disengaged and the duel came to an end.