The battle with Obi-Wan and Anakin had taken a lot out of Count Dooku, though he was a former Jedi Master and a renowned lightsaber duellist.
Star Wars Fact File #103


The battle with Obi-Wan and Anakin had taken a lot out of Count Dooku, though he was a former Jedi Master and a renowned lightsaber duellist.
Star Wars Relaunched Fact File #57
 


Anakin was blasted back by Force energy. He fell to the ground beside Obi-Wan. Dooku, though tired, seemed to have won.
Star Wars Relaunched Fact File #57 



Dooku was already tired from his duel with Obi-Wan Kenobi and Anakin Skywalker when Yoda arrived.
Star Wars Relaunched Fact File #71