From the US OPEN-

This year, del Potro was very consistent and very powerful. At the 2018 US Open, in the quarters, he took down the red hot American John Isner 6-7, 6-3, 7-6, 6-2. He barely made any unforced errors, his serves were massive, and his heavy forehand was thick and powerful.

As he said, according to Isner, del Potro is locked in.

“He’s doing pretty well. He’s maybe playing some of the best tennis ever right now for him,” Isner said. “[Juan ] knows what he needs to do. He may need to improve a little bit, and he knows that. But I think he’s playing very well. He’s given the top guys a lot of trouble before. Rafa [Nadal] at Wimbledon. He beat Roger [Federer] in the final of this event nine years ago. He’s back in a good spot, competing for a Slam title. He’s in the final four, so he’s certainly got a very good shot.”

Yes he does.  In March, the Argentine finally won an ATP 1000, winning Indian Wells , upending Federer 6-4, 6-7, 7-6 in the final. That was a constant booster. He was tired, but he decided to play Miami, the next week, and he made it all the way until the semis, losing against — believe it or not — Isner.

A few weeks ago, on grass at Wimbledon, del Potro reached the quarters, and he was very close to win it, but in the fifth set, the Spaniard Nadal out-stroked him 6-4 in the fifth. Close, but no cigar.

Del Potro seems pretty healthy again, and driven. He is a tall person, and a smart person. As he says, whether he has to face Nadal or Dominic Thiem, it will be a big battle and he will love it, competing.

“ I’m very happy for my level, for what all has been through to get in this position now. It doesn’t matter the final result in the tournament. I just enjoying playing tennis again,” Del Potro said. “I’m enjoying a lot the crowds. That’s makes me feels alive again. After all my problems, I think it’s time to celebrate. I love this sport. I love the competition. I’m very proud to be here again.”