Damir Dzumhur collides with Roland Garros ball kid in loss to Alexander Zverev

There was a troubling moment during Alexander Zverev's win over Damir Dzumhur, with the latter in a nasty collision with a ball kid. 

After Zverev completed a masterful comeback to defeat Dzumhur 6-2 3-6 4-6 7-6 (7-3) 7-5 in over three hours.

It was during a break however that Dzumhur ran to collect a ball overhead on the court, only to collide with a ball kid who was also running to catch it.

The Bosnian was instantly worried for the young boy who laid flat on the clay court. Dzumhur called for medical attention before comforting him with a warm hug and reassuring words.

Thankfully the ball kid was alright and watched the remainder of the match from the photographer's dugout courtside.

Despite the loss, Dzumhur gave another shoutout to the boy on social media.

"Thank you Roland Garros and the Chatrier crowd, thank you to the great people at home for my support. Thank to my team. Good luck to Zverev," he tweeted.

"And also sorry to my new friend but I’m glad you’re okay."

It was the first time Zverev had defeated a top 50 player, the first time he reached the fourth round at Roland Garros and the first time in his career he won a contest on the main Philippe Chatrier Court.

"It was a very tight match. It's normal there were a lot of nerves involved. In that moment, it's all about finding a way," said the second seed, who was also taken the distance by Serbia's Dusan Lajovic in the second round.

"Even if you're not playing your best, it's all about finding a way to win and finding the right solution to the right moment.

"I'm trying to win matches. If it takes me three sets, great. If it takes me five sets, that's also great," added the 21-year-old who now has a 6-5 win-loss record in five setters.

"I'm trying to win. That's all that matters. It doesn't matter how long it goes.

"It doesn't matter how much time I'll spend on court. It doesn't matter if it goes 9-7 in the fifth or it goes 6-1 6-1 6-2. I'm in the next round and that's all that matters."

With only one fourth round appearance to show for his 11 previous visits to the majors, the two five-set thrillers he has survived in Paris might turn into his coming-of-age moment.

"It was important to see for myself that I can win back-to-back five-set matches and both very difficult physical matches," he said.

"So this gives me a lot of confidence. It was an important point to prove to myself as well."