The ruling

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"My servant Kalev, because he possessed in him a different spirit, and followed me fully, I shall bring him into the land to which he came, and his children will cast [its inhabitants] from it." Kalev merited receiving the city of Chevron because he did not listen to the plan of the Meraglim. Why was Kalev singled out for reward and not Yehoshua who also did not listen to the Meraglim? The Panayach Raza answers that Yehoshua had help in fighting against the Meraglim. Yehoshua was armed with Tefillah of Moshe who davened for him, "Koh Yoshiacha MayAtzas Meraglim" - "Hashem should help you against the plan of the Meraglim". However, Moshe did not daven for Kalev, therefore Kalev, who fought them on his own, merited receiving the city of Chevron.

The Ibn Ezra answers, since it was Kalev who silenced the Meraglim (as the pasuk says, "Vayahas Kalev"), he was the one to receive this gift from Hashem. 
http://www.revach.net/parshas-hashavua/quick-vort/Parshas-Shelach-Kalev-Is-Rewarded/2347

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