The Argentinian said it was important for him to stay fit for the rest of the season but that he was doing the best he could because Miami was an important tournament, reports EFE news agency.
"I'm tired, its taking a toll on me because I have been playing many matches and been on tour for a long time," del Potro told reporters on Friday after defeating Dutch Robin Haase 6-4, 5-7, 6-2, in a match where he displayed visible signs of exhaustion.
He also acknowledged persistent minor pains were bothering him and reiterated that his main aim for the season was to take care of his body.
"Miami is an important tournament, but whatever happens, it will be fine for me, because if I have to stop I'll have a well-deserved break and continue playing too," he said.
The Argentinian will now face Japanese Kei Nishikori (26), who beat Australian John Millman 7-6 (4), 4-6, 6-3 on Friday.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
