Isner stuns Del Potro to reach Miami final

John Isner produced a blistering Miami Open semi-final display against crowd favourite Juan Martin Del Potro to win 6-1, 7-6 (7/2) and snap the former US Open champion's 15-match winning streak. It was a phenomenal effort from the American who blasted down 13 aces and took just one hour and 23 minutes to floor Argentina's Del Potro and book his place in Sunday's final. Isner will meet world number five Alexander Zverev in the final after the German rolled over Spaniard Pablo Carreno Busta 7-6 (7/4), 6-2 in the other semi-final. "I have played a lot of big matches and not been able to get such a  good start but I am playing some of the best tennis I have played in such a long time," Isner said.

We are too, John. ?#MiamiOpen pic.twitter.com/siGpWsy1Ho

— Miami Open (@MiamiOpen) March 30, 2018

"I started the tournament well and I have improved with every game. I am super fresh and ready to go for the final." An exhausted Del Potro said he is looking forward to some much-needed time away from tennis before deciding on when to play next. Winning the final would have seen him climb to world number three but simply staying fit for the French Open in May is the ultimate goal. "I don't want to think about tennis right now," said the Argentine. "I just want to stay healthy and maybe I will miss a few tournaments to get ready for the French Open. We will come up with a schedule for the clay court season.

Isner clinches a 6-1 7-6(2) victory & his place in the #MiamiOpen final, ending Del Potro’s 15-match winning streak. ➡️ https://t.co/XL0b3Stv2m pic.twitter.com/eEok2rsP8Q

— ATP World Tour (@ATPWorldTour) March 30, 2018

"I will go home now, eat some barbeque, spend time with friends and not talk about tennis for the next few weeks." Isner, who won an impressive 83 percent of points on his second serve, was aiming to reach his fifth ATP Masters final and, finally, emerge victorious from one after four defeats. The American had never reached the showpiece here but knew that with the fit again Del Potro in such devastating form and unbeaten in his last 15 matches, it would take a monumental effort to upset the Argentine and his hordes of followers at Crandon Park. The American wasted no time in breaking Del Potro and racing into a 3-0 lead while sending down five aces on his own serve to brilliantly wrap up the first set in just 27 minutes.

Born in the ??@JohnIsner defeats Del Potro 6-1, 7-6(2) to reach his first #MiamiOpen final and fourth career Masters 1000 final. ? pic.twitter.com/0eKpjvvWN2

— Miami Open (@MiamiOpen) March 30, 2018

The second set was a tight affair, going into the ninth game with the match delicately poised at 4-4. Isner suddenly had a chance to break which was saved by Del Potro after the world number 17 hit the net, a mistake which was punished by an ace and drop shot from the crowd favourite. Deafening chants of 'Delpo, Delpo' rang around the main stadium here as the 29-year-old tried to force a deciding set yet Isner's serve held firm to force a tie-break.

Best set of tennis all year?@johnisner hits 19 winners en route to taking first set 6-1 over Del Potro.#MiamiOpen pic.twitter.com/4YszpXH5im

— Tennis TV (@TennisTV) March 30, 2018

The momentum was with the American, his serve reaching 136 mph as he flew into a 3-0 lead. Isner's serve was relentless and on target every single time making it impossible for Del Potro to get a foothold in the game, and when an excellent passing shot gave Isner four match points, he took the first with a brilliant drop volley to complete one of the finest wins of his career. "When he plays like that, he’s one of the toughest guys on tour to beat," Del Potro said. Fourth seeded Zverev needed 88 minutes to oust Carreno Busta and punch his ticket to the final.

A third Masters 1000 final for Alex Zverev. The young German too good for Pablo Carreno-Busta 7-6(4) 6-2.#MiamiOpen pic.twitter.com/o7WfjxQICl

— Tennis TV (@TennisTV) March 31, 2018

The 20-year-old Zverev will be seeking his seventh career ATP title and first of the season when he faces Isner. Zverev blasted 10 aces and won 88 percent of his first serve points in his first career meeting with the 26-year-old Carreno Busta. "Every day I want to serve big," said Zverev, who improved to 13-4 on the season. "I was very fortunate to win the first set and then I found my game in the second set."