Yes, Ashe won his first match after 18 or so losses against Laver in 1974 at the World Cup Australia vs. US, and beat Laver shortly thereafter in a WCT event. He tells about it in his book Portrait in Motion. In 1975, when Ashe was Nr. 1 of the World (in most eyes), he was still 0-2 against 37 years old Laver. The last match - i have seen on tv - was at Rotterdam in 1976, when Ashe came back from a set down and 1-4 deficit and won in 3 sets. Overall it was something of 21-3.