UPDATE 4-Tennis-Nadal beats Verdasco, Federer to meet Djokovic

* World number one Nadal reaches Rome Masters semis

* Federer beats German qualifier Zverev

* Holder Djokovic eases past Del Potro

(adds Nadal's opponent)

By Paul Virgo

ROME, May 1 (Reuters) - Top seed Rafael Nadal overcame fellow Spaniard Fernando Verdasco 6-3 6-3 at the Rome Masters on Friday while Roger Federer beat German qualifier Mischa Zverev 7-6 6-2 to book a semi-final with holder Novak Djokovic.

Serb Djokovic eased through with a 6-3 6-4 triumph over Argentine fifth seed Juan Martin Del Potro.

Nadal next faces Chilean 12th seed Fernando Gonzalez, a 2-6 6-3 6-4 winner over Argentine qualifier Juan Monaco.