Why was Saul praying after he was blinded on the Damascus road?
Saul prayed because he suddenly realized that Jesus, whose name he had spent years suppressing as a blasphemer and demon, was the God he thought he served. That shocking reversal drove him to prayer, and the Lord told Ananias, 'Behold, he prayeth.'
Les explains that Saul had spent years suppressing the name of Jesus of Nazareth as a blasphemer and demon, the worst possible. Then he suddenly realized it was the God he thought he served, so he prayed. The Lord told Ananias that Saul was praying and had seen a vision of Ananias coming to restore his sight. Though Ananias knew Saul had authority to arrest believers, the Lord called Saul a chosen vessel to bear His name before the Gentiles.
And the Lord said unto him, Arise, and go into the street which is called Straight, and enquire in the house of Judas for one called Saul, of Tarsus: for, behold, he prayeth,