"They still feel that motivation to keep fighting, training": Dimitrov's coach sees Murray, Wawrinka and Del Potro as 'even more aliens'

Daniel Vallverdu currently coaches Grigor Dimitrov but some of his best successes have came with Stan Wawrinka who he said alongside Andy Murray and Juan Martin del Potro can be compared to aliens.

This compared to the current crop of tennis talent with their resolve to come back from injuries, setbacks and losses.

Especially for Murray and Wawrinka with the former playing with a metal hip and still producing some epic displays and showing glimmers of a return to his best.

"If I told you that the ones now are aliens, these [Murray, Wawrinka and del Potro] are even more aliens," he said to Punto de Break.

"They still feel that motivation to keep fighting, training and improving," the Venezuelan coach continued.

"If they lose, nothing happens, they will go to the next tournament with the same willpower. I really can't wait for the day they finish, they will make that decision when they see that mentally enough is enough."