I would rather suffer than being embarrassed ....
Pharaoh asked Moshe to daven for the frogs to be removed from Mitzrayim. Moshe inquired when Pharaoh would like him to daven for them to be removed, and Pharaoh said 'tomorrow'. Moshe agreed and the next day he davened to HaShem to remove the frogs (8:4-6).
The question is, if Pharaoh is suffering from the plague of frogs, why did he not ask Moshe to daven to have them removed today? Why wait for tomorrow?
The answer is that Pharaoh was embarrassed to show that he was in critical distress due to the plague, and he therefore asked for Moshe to daven for their removal 'tomorrow' (Mosh av Zekeinim).
Others say that Pharaoh had hopes that his sorcerers would find a way to remove the frogs today, so he told Moshe to only daven tomorrow (Tosfos Hashaem).
