That would be 157.2 miles per hour in the 2016 Davis Cup.
If John Isner is able to play at the level he has in recent matches, then there will be no stopping him in this final.
"I was fortunate to get a del Potro who is very, very low on fuel", Isner said.
Both finalists have played some of their best tennis throughout the Masters 1000 event, beating several top seeds and barely showing any signs of weakness. "Since I first got to Miami, we have been having dinner every night and talking some things over".
TwitterPaul Annacone has praised Juan Martin del Potro
"I just want to stay healthy and maybe I will miss a few tournaments to get ready for the French Open".
"I tried to be more aggressive".
"There was a game plan. Depends how I feel", Del Potro said. He serves unbelievable. He plays great tennis on the tiebreak.
Despite his booming and crowd-pleasing serve, Isner would have to be considered the underdog against Zverev. But keep in mind that three years ago after losing in the Miami first round, the Argentine left ranked No. 555.
Isner was playing in his 11th career ATP Masters 1000 semifinal, and is now into this third career final.
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In the other half of the draw, Juan Martin del Potro set up a rematch with Milos Raonic after their one-sided semi-final meeting at Indian Wells, with the Argentine looking to extend his 14-match winning streak.
Zverev somewhat downplayed his performance in Miami.
"I think the main reason why I'm playing so well - there is two reasons, really", he explained. "I'm playing well now". "I also think he has a big potential to reach the final here, so it's going to be a hard challenge to me".
"I mean, look, it's going to be a completely different match", Zverev predicted.
Isner will need to be his best in facing Zverev, who hasn't dropped a set in his last three matches.
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One thing Zverev is extremely aware of is the difficulty of Isner's serve. "But I would love to go home, to stay in Tandil eating barbecues, spend time with my family and friends and not talk about tennis for a couple of weeks".
"The first set was pretty easy", the American said. Zverev spends much of his time living and practicing in Florida and has become a huge Heat fan.
Many readers may be surprised at this, because on the surface, three head-to-head wins in the last 18 months would appear to be pretty relevant, but upon closer examination, it is very evident that Zverev was not as dominant in these matches as the scorelines would have you believe.
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