lol.. 4.5? you guys must be kidding..
I can only rate the server and that too not much to look at other than the serve. If the server plays an entire match like these 3 points then:
His serve seems very good and on first impression, I think in Socal, he would crush 4.5s. Definitely 5.0+ and would not be surprised if the server is an ex college level player or 5.5-6.0. Gotta see atleast 10 more points to determine that.
at 54 seconds, the first serve did not miss by much and judging by the speed at the backstop that serve was 105+ mph and also had a good amount of topspin action on it. Leads me to think that he could get a very decent percentage of first serves at 100+ mph.
His second serves were very good too, and a decent first volley on the second point.
His backhand passing shot on the first point was too flat (not enough topspin), probably the only thing in the video that is a negative against the server.