Roger Federer admits he is even surprising himself, as he continues to produce top-class tennis at the age of 32.
The 17-time Grand Slam winner came mighty close to claiming another title on Sunday when he lost in the final of the ATP Masters tournament at Indian Wells in California.
The world No 5 was beaten in a final set tie-break by Novak Djokovic who had lost to Federer just a few weeks before in Dubai.
His loss to the Serb at the weekend ended a run of 11 straight wins and Federer now heads to America's east coast for this week's hard court event in Miami.
The Swiss superstar said: "I'm very happy. I think I'm playing really good tennis. I'm moving well, serving well - consistently well. So many things are working.
"I'm just surprised that I'm able to keep it up week after week now. I expected myself to have a breakthrough tournament but then maybe a couple of early exits.
"But overall I'm just happy, I'm playing consistent tennis and I'm going deep in tournaments and I'm giving myself chances to win.
"Clearly it would have been amazing to win here and win back-to-back tournaments with Dubai.
"But I got very, very close, so it's encouraging for Miami and for the rest of the season, no doubt."
His recent run of victories has moved him back up the ranking from eighth to fifth but he is not overly concerned about his position on the ATP Tour ladder.
He added: "Being number one would be a big deal but being number four or number three, that's not a big deal.
"It might help the seedings and the draws but, other than that, just right now, to think too far ahead will be a mistake.
"A few weeks ago, months ago, a few people said I couldn't play tennis any more. So for me, I need to focus on my own game, my own routines, hard work, make sure I keep a good schedule for myself, for my family, and enjoy it.
"But at the same time, that fire, wanting to win, is important and right now I have that. I think I have a really good balance."