On Friday, John Isner produced a blistering Miami Open semi-final display against crowd favorite 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 also added "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 Miami Open final would have seen him climb to world number three but simply staying fit for the French Open in May is the ultimate goal. The 20-year-old Zverev will be seeking his seventh career ATP title and first of the season when he faces Isner.