'Tough to watch': Teen tennis star in frightening mid-point collapse

A 19-year-old rising tennis star’s ailing body has cost him a massive upset at the Miami Open after a frightening collapse on court.

Spaniard Nicola Kuhn was forced to retire in the third set against German veteran Mischa Zverev amid distressing scenes.

The world No.272, already staving off fatigue, fell to the floor with significant leg cramping as he attempted to move towards the net to retrieve a slow slice.

‘RIDICULOUS’: Aus Open ‘brat’ loses the plot in meltdown

The crowd was left in a stunned silence, especially as it took more than 15 seconds for help to arrive.

Kuhn remained in severe discomfort as ATP physio Alejandro Resnicoff tended to the player.

Zverev sportingly assisted with the delivery of water bottles but the teenager was unable to walk himself off the court, leaning into Resnicoff to avoid walking.

Nicola Kuhn required assistance from the ATP physio, even to walk himself off the court. Pic: TennisTV

Canadian tennis stars Denis Shapovalov and Felix Auger-Aliassime, who experienced a similarly emotional retirement at the US Open last year, tweeted their support for Kuhn.

“Such a brutal sport this is. Hope he is okay,” Shapovalov tweeted.

Auger-Aliassime wrote: “That’s tough to watch. Hope you’re well, my friend.”

Kuhn’s physical ailments were all the more devastating for what came before.

After winning the first set he led 5-2 in the second before having an incredible eight match points saved across two service games.

A wildcard entry into the tournament, the match was Kuhn’s first since a Challenger defeat in Phoenix nearly 10 days ago.

Zverev will face 17th seed Nikoloz Basilashvili in the second round.

Stosur takes early victory

Australian tennis star Samantha Stosur has progressed to the second round of the Miami Open after a first-up win over Russian Evgeniya Rodina.

Stosur triumphed 6-4 6-2 over Rodina in just over 90 minutes, hitting five aces and winning three quarters of all breakpoints.

The world No.78 will face American Madison Keys in the second round, with the victor likely to face Australian Ashleigh Barty.

with AAP