I think Lendl+Sampras = Graf (again 8+14) is a better ecxample.
Plus she shared being No.1 from 1987-1990 with Lendl and being No.1 from 1993-1996 with Sampras.
8 years as No.1 (4 with Sampras and 4 with Lendl). And all the three were single handed backhand players with a pretty high toss and all the three were INTROVERTS.