Lucas Pouille (France)
Pouille made his mark when he ousted Nadal from last year’s US Open in a pulsating four-hour, fourth-round upset. That led the now 15-times grand slam champion to remark that Pouille “could fight for the big things the next couple of years”. The Frenchman’s grasscourt pedigree looks good after he reached the quarterfinals at the All England Club last year, and he underlined his progress by claiming his second tour title of the season at the Wimbledon warmup event in Stuttgart.
Age 23, ranked 15