Norwegian meets the surprise man Francisco Cerundolo from Argentina.
ZVEREV seemed to have torn the game after a weak first sentence in the second passage of himself, then in the third set but quickly again with a break behind and could no longer catch up on this residue.
The world ranking listed it missed the chance to get back into the race with a triumph in Miami before starting the sandplatz season to the number one of the world ranking.
Zverev achieved this year only in February in Montpellier the final of a tournament.
Most recently, the 24-year-old had already failed at the prestigious Master in Indian Wells at his first match.
The hard room tournament in Florida is endowed with around 8.6 million US dollars and is one of the most important events on the ATP tour.