India A captain Yuvraj smashed an 89-ball 123 as the team won by 77 runs in the opening game of the three-match one-day series.
"It's always amazing to get a hundred. It's the first game of my season, and everything fell in place. I had worked quite hard in the off-season," Yuvraj told reporters at the M Chinnaswamy Stadium after the match.
"I've been working on my batting and skills in the last couple of weeks. I just wanted to take some time at the start and attack when I needed to. It's a very good feeling," he added.
When asked about his motivation to make a comeback to the Indian team, the left-hander stressed on the passion for the game.
"I think my passion for the game. I'm too passionate about my game. In the IPL I had a back injury and I was struggling with it. I just wanted to work hard on my fitness. I was focused on training, and was focused on where I had my weaknesses, on my lung capacity, my diet, in my off-season with Zak (Zaheer Khan). Tim Exeter, whom we trained with, has done wonders for me and Zak in terms of getting back," said Yuvraj.
The Punjab batsman said he had belief that he would do well.
"I always had the belief that when I'm feeling well from inside, I'm going to do well. It's taken a lot of time, because the body has gone through a lot. You just can't go through such a disease and come back and say 'okay, I'm going to be 100 per cent'.
It's taken a lot of time for my body to heal. And it's just getting better and better, with every off-season I've spent. I'm just happy with the way I hit the ball today and hopefully I can carry on this form in the coming months."
The second one-dayer is tomorrow at the same venue.