Isner has just won 2-0 against Del Potro (who breaks a streak of 15 consecutive wins!) and is the first finalist in Miami.
Del Potro seemed tired, while Isner is at the height of his physical shape and has been devastating with his service!
His serve is the fastest I think this tournament.Del Potro seemed tired, while Isner is at the height of his physical shape and has been devastating with his service!
One of them was clocked at 139mph.
I think I've only seen someone do 142mph last year so this is very close to that maximum speed for a serve.
Del porto did not have a chance to return those in the final set and that is what destroyed his chances in winning the match because he was still tired from all the matches he has played already. John Isner caught him on a day that he was utterly gassed and could not return those serves. I think he struggled on his serve too because he had only 4 aces against Isner's of over 12 by the end of the match.
#JustKeepPounding
