What is John Isner's highest singles ranking in his career?
No. 8
No. 5
No. 12
No. 3
Answer
John Isner achieved his career-high singles ranking of No. 8 in July 2018 after winning his first Masters 1000 title at the 2018 Miami Open and reaching the semifinals at the 2018 Wimbledon Championships.
Acing the John Isner Quiz: Test Your Knowledge on the Towering American Tennis Star!