Originally Posted by pc1
No just the second serve but his first serve was also considered to be superb, perhaps slightly below the level of Gonzalez. His second serve was considered to be the best of all time by many. His volley was strong and penetrating and was considered only slightly below that of Frank Sedgman, who is arguably the best volleyer of all time.
Just to show how great he was, Kramer still holds the record for fewest games lost at Wimbledon.
Here's the game scores
1. 6-0 6-1 6-0
2. 6-2 6-2 6-2
3. 6-0 6-2 6-0
4. 7-5 6-2 6-3
5. 6-0 6-1 6-3
6. 6-1 3-6 6-1 6-0
7. 6-1 6-3 6-2
That's pretty awesome on fast uneven bounce grass.
What are credentials? The guy had the credentials to be the best in the world for years and arguably at his best he was the best ever. He beat Segura, Riggs, Sedgman and a young Pancho Gonzalez (who still was a superb player but not quite THE Gonzalez) on tour and beat them easily. And he won a number of Pro Majors. He won three classic majors and that was with an interruption due to World War II. Now to be fair I don't think he was the GOAT but I think he does have a case for it. I think Kramer is superior to players like Roy Emerson, Agassi, Ashe, Nastase, Smith, Vilas, Roche and he has a case over any player including Laver, Federer, Connors, Tilden Gonzalez etc. He is one of the few you can argue to be the GOAT without it being a stupid argument.
pc1, I rank Kramer in a group with McEnroe, Vines, Lendl and Hoad regarding achievements, just behind first tier (Tilden, Gonzalez, Rosewall, and Laver) and behind Borg, Sampras and Federer.