Since he sorted his back in 2007, and learned how to keep the rest of his body fit, he's occupied a spot in the world's top 100 and earned a good living. His biggest pay cheque came from a quarter-final at Wimbledon in 2010 but, for every decent week, there have been a lot more that have been a struggle and it's part of the reason why he contemplated retirement recently.
"I was thinking I was a little bit tired because I have been travelling for 14 years," he said. "I was thinking maybe this would be my last year. I don't know. I told myself I should try to enjoy it, even this tournament. Everything can change with the next day, the next match. I have always been working, working, working; push, push, push."
His success at the Heineken Open might convince him to remain on the tour a bit longer. After all, he dispatched four-time Heineken Open champion and world No3 David Ferrer in straight sets in Friday's semifinal.
"The last few years of my career, I always played some good matches but I didn't play consistently. This week, I showed I can play consistently every day and get to the end of the tournament. I can get some confidence from this week."
Isner, who won his eighth title yesterday, agrees.
"If he continues to play like this, he will see himself in another final. He's a very talented player and, when he's playing well, can give anyone a run for their money as we all saw when he beat the No3 player in the world."