Answer: John Isner
Notes: John Isner, an American professional tennis player, has won the 2018 men's singles Miami Open tennis tournament. In the title clash, the 14th seeded American defeated fourth-placed German Alexander Zverev, 6-7, 6-4, 6-4 to win his first ever Masters 1,000 title. With this win, Isner returned to his career-high ranking of world No. 9.
