Del Potro continued his run of excellent form at the Masters event as he overcame a 1-4 deficit to defeat No. 22 seed Filip Krajinovic of Serbia 6-4, 6-2 for his 14th consecutive victory.
However, both Zverev and Isner, who had struggled in the new season before heading to Miami, stepped up their games and are now a win away from clinching the prestigious hard-court Masters 1000 title. A precise backhand down the line put him 40-15 ahead and the second break point was converted with a delicate touch at the net.
Notably, Zverev had defeated his American opponent twice a year ago, including the Miami Open third round victory, which came after he had saved three match points.
The first set, in which Isner fired down 19 winners, was sealed in typical fashion with a brutal serve out wide, but the second proved far more attritional.
It was the first semi-final match of the day, with the American dominating proceedings and del Potro, playing out-of-sort. "But today John played better".
"I don't want to think about tennis right now", said the Argentine. "I'm toward the latter part of my career; this is the best moment of my career".
"I was just ready for this moment", Isner said in a TV interview just after the match ended.
Isner fights back to lift Miami title
"I mean, look, it's going to be a completely different match", Zverev predicted.
Finally, in-form Hyeon Chung beat Joao Sousa 6-4 6-3 to advance to the quarter-finals and will take on John Isner.
"As always, I have been feeling tight in all my body for the last couple of weeks, but when I get into the court, I love to play tennis", del Potro said afterward.
Isner's final obstacle is Zverev, a player as tall as del Potro but still four inches shorter than Isner.
The most fascinating part of this matchup is seeing the efficiency of Isner coming into the forecourt against someone that strikes their passing shots as fluid as Zverev does.
Isner, 32, has won 12 singles titles during his career, but he will seek his first in a 1,000-point masters tournament. Zverev defeated Spaniard Pablo Carreno Busta in straight sets 7-6, 6-2.
"It's going to be a completely different match (than the one today), said Zverev about the final". And he's never lost once he reaches the semifinals at this level, though the lose set he did lose was to Isner at Rome.
I'm just trying to fight for every point and be more consistent and I think I'm getting there in my form. Collins won an impressive 66 percent of her service points as she was only broken once by Williams.
The complaint of the paper leak , Upadhyay said, was made after the CBSE received information from an unnamed source. The dates of the fresh examinations and other details will be declared on the board website (www.cbse.nic.in) later.
Lord Herman Ouseley, chair of Kick It Out, said there is a need to clamp down on racism in the country ahead of the World Cup. Pogba doubled the advantage four minutes after the break with a curler into the bottom corner past the diving Andrei Lunev.
Trump signed the " Vietnam War Veterans Recognition Act of 2017 " which established March 29 as the national day of recognition. In 2011, the Montana Legislature passed House Bill 255 which established March 30 as Welcome Home Vietnam Veterans Day.
If you adore Netflix's " Stranger Things " throwback style, expect to have a blast with this nostalgic romp through the 1980s. The screenplay from Zak Penn and Ernest Cline is inventive and buoyant, barrelling along without hitting too many slow spots.
Gopalrao, a postal clerk was determined to educate his wife when she expressed her wish to study medicine at the age of 14. Her ashes were sent to Theodicia Carpenter, who placed them in her family cemetery in Poughkeepsie, New York.
BJP President Amit Shah, who is on a two-day tour in central Karnataka, expressed confidence over a poll victory. What has come as a shocker to many netas is the fact that the Counting Day ( May 15 ) is "Amavasya Day".
Ingraham sparked major outcry after she said that James and Wade should "shut up and dribble" rather than commenting on politics. I will only accept your apology only if you denounce the way your network has treated my friends and I in this fight, ' he wrote.
On Wednesday, Prime Minister Narendra Modi's government took a decisive step in that direction - of exiting Air India. The government has injected $3.6 billion (Rs 23,461 crore at $1 = Rs 65.17) since 2012 to bail out the airline.
Person dies after using synthetic marijuana
IL health officials say one person has died after experiencing severe bleeding following the use of synthetic cannabinoids. Shah says they're unsafe because it's hard to know what chemicals they contain or what an individual's reaction will be.
Salah Hits Goal No.29 As Liverpool See Off Crystal Palace
Liverpool had further chances and so did Palace but it was Salah who once again came to the rescue - saving the visitors' blushes. The result has left Palace in 16th position in the Premier League table - two points clear of the relegation zone.
EGP 500 Fine for Not Voting in Egypt's Elections
In an interview days ahead of the vote, Sisi said he had wished there were more candidates, denying any role in sidelining them. About 60 per cent of the country's 25 million voters boycotted the poll.
Facebook to sever ties with 'data brokers' who target ads
Previously, the settings were spread across almost 20 different screens and they're now accessible from a single place. Facebook Inc ( NASDAQ:FB ) continues to make moves in an attempt to shore up trust in how it handles customer data.
First Warning Forecast: Warm Then Wet Weather
Next week we will start off in the 50s Monday with a 50% rain chance and slowly warm back into the 60s for the rest of the week. Up to 20cm of snow fell, especially on higher ground, and there was significant drifting caused by the strong easterly wind.
"Who bit Beyonce" taking over Twitter
Fans quickly dissected the section of the song and claim to hear the name " Tiffany " right after Bey says "NDA". Yes, we're OF COURSE talking about the alleged starlet who had the GALL to bite Beyoncé on the face.
Appeals court grants new trial in "Serial" case
Prosecutors appealed that decision to the Maryland Court of Special Appeals , the state's intermediate appeals court. On Thursday (local time), the Maryland Court of Special Appeals upheld the ruling, granting Syed a new trial .
Xbox Games With Gold for April 2018 Revealed
Even if you don't plan to play the games now, it's worth getting them added to your library for potential future gaming sessions. Finally, from April 16 to April 30, Xbox 360 owners will also get a copy of Dead Space 2 on the house.